Acts of Stupidity by Character

Many of the deaths that occur in Happy Tree Friends are a result of the main characters doing something ignorant, unwise, or downright stupid. Almost every character is prone to committing these actions, causing the deaths of themselves and/or others around them.

Cuddles
Cuddles is known for being mischievous and self-centered, which is often the root cause for his actions.
 * Water You Wading For: Cuddles jumps into a lake despite the fact swimming is not allowed, which Flaky points out. Because of this, Cuddles is attacked and killed by creatures in the lake.
 * Sweet Ride: He doesn't look where he's skating, causing him to crash into a staircase.
 * Flippin' Burgers: When Fliqpy sticks a straw in his chest his blood spurts out of the straw so he drinks his own blood thinking it would help, then dies/passes out from massive blood loss. (Debatable, because he couldn't think of any other way to save himself.)
 * Let It Slide: Oblivious that a water valve was turned off, Cuddles pushes Flaky down a dry slide, skinning her and loosening all the bolts on a section of the slide.
 * Can't Stop Coffin: He climbs over a fence without seeing what's on the other side (in this case, a deep hole where he gets trapped in a coffin, burnt, drowned, and subsequently killed).
 * Change of Heart: He plays soccer with Handy's heart.
 * Dunce Upon a Time: He chooses a hiding spot where he's standing on blades designed to finely grind. He also visibly and audibly moves in this hiding spot giving away his location to Giant Lumpy (to be fair, he was hiding in a pepper grinder, and he couldn't help to sneeze).
 * Aw Shucks!: He drives past a boom gate that, although malfunctioning, was clearly trying to go down, indicating that a train was coming.
 * Hear Today, Gone Tomorrow: In the beginning scene, despite being a rabbit, he holds the tin can phone to the side of his head where a human ear would go instead of up at the base of his ears. This could likely be the real reason he couldn't hear Lumpy.
 * YouTube 101: Subscriptions: He believes that Giggles was actually on a date with Disco Bear despite her obvious hatred of the bear. (to be fair, this was mostly Disco Bear's fault)
 * Breaking Wind: He stands outside in plain sight, not making any effort to protect himself from the tornado.
 * You're Kraken Me Up: He doesn't see the tentacle controlling Giggles even cheering when Lumpy "saves" her.
 * TV Series Volume 3 (cover): Lets The Mole cut his hair, resulting in his head being chopped off.
 * TV series Volume 1 (cover): Sticks a fork in an electrical outlet and is electrocuted, his eye popped out and he may have died.

Giggles
Like most characters, Giggles is blissful ignorant and is unaware of hazards until the last minute. She does seem to be narrowly smarter than the other characters.
 * Eyes Cold Lemonade: She sets Petunia's eye juice to sell or drink later even after tasting it.
 * Better Off Bread: Giggles skips through flowers until, not watching where she was going, she falls off a cliff. (Debatable because the cliff might not have been visible against all those flowers).
 * Tree Kringle: While mostly on Lumpy's accord, Giggles unwisely stood in the spot where Lumpy was about to swing his axe.
 * Every Litter Bit Hurts: She puts a wooden hair brush in a plastic recycling bin. (However, she didn't have a trash bin)
 * Something Fishy: After Russell's Piranha jumps in her cup of water, Giggles drinks it without looking inside first. Thus the piranha chews her to death. (Debatable because how many times do people really look in their drinks?)
 * Breaking Wind: She stands out in the open while a tornado is coming, making no effort to get to a safer spot.

Toothy
Toothy tends to act on impulse, in terms that he chooses not to think before doing things.


 * Nuttin' but the Tooth: While performing dentistry on Nutty, he reads a book on how to perform the operation the whole time instead of actually reading it before hand, he pierces a needle all the way through Nutty's cheeks so that none of the Novocain even entered him . Then he makes a hole through the back of Nutty's head using a power drill. After that, he tries to remove a loose tooth by tying a string to it, removing Nutty's lower jaw in the process.
 * Class Act: As he flees in terror, he tosses a lit candle near a stage curtain, creating a fire that burns down the school. (Debatable because it was a reaction)
 * Mime To Five: Rather than the recommended two spoonfuls, Toothy pours two whole barrels of gunpowder into a cannon. This leads to an explosion that kills Toothy and splits Cuddles in half. (Debatable because Mime didn't give very good instructions)
 * Cold Hearted: He tosses a snowball at Giggles just as she was about to kiss Cro-Marmot. This leads to Giggles' eyeballs getting stuck to the ice, forcing her to pull them out. (Debatable because this could be a prank.)
 * Brake The Cycle: He rides his bike despite the fact a bolt is missing (which he clearly knew was missing), leading it to fall apart and gradually kills him.
 * His Smoochie: He eats a rotten Easter egg with little thought, poisoning himself seconds later.
 * Kringle Karols: He attempts CPR on Cuddles by pressing on his stomach or even pelvis instead of chest. Also considering the damage, even correct CPR would do nothing.
 * Better Off Bread : He is oblivious to the fact that Giggles was dead when Splendid put her down and witnessed a shower of meteorites and made no effort to run for shelter, resulting in his death.

Lumpy
Lumpy is considered by most fans as the least intelligent and dumbest character in the series and is responsible for the majority of the stupid acts committed in the show. While famous for getting others killed, his stupidity maybe to the point where he can be regarded by some as being retarded. However, on closer examination, this may not be the case.
 * Spin Fun Knowin' Ya: He spins the merry-go-round so hard it causes Cuddles, Toothy, and Giggles to fly off (to be fair, they did keep tell him to spin it faster).
 * Wheelin' and Dealin': He wears a snorkel and scuba mask in a car race.
 * Treasure Those Idol Moments: He runs over Flaky in clear sight while she was in a playground.
 * You're Bakin' Me Crazy: He brings Petunia a blood-covered cake and stupidly says "Merry Christmas!" at her birthday party.
 * Meat Me for Lunch: He doesn't seem to care at all that Lifty & Shifty were killed, and used their remains to make meat for his butcher's shop (Debatable; Lumpy not caring that the raccoons were killed and feeding them to his customers simply could have showed his vengeful side. However, he looks surprised when Petunia realizes she was eating someone.
 * It's a Snap: He falls for bear traps baited with cheese.
 * Snow What? That's What!: He lies shirtless on a hammock with a drink in the winter. (Debatable: Because, he seemed completely unaffected by the cold just like real moose and might have just been embracing it.)
 * Happy Trails Pt. 1: He isn't paying attention to the road (even walking away from the wheel), causing the bus to crash onto a desert island. (Debatable, Petunia and Mime took his attention away from the road.)
 * Class Act: He instructs Toothy to go on with his act despite the other play actors' injuries (possibly done out of apathy, not stupidity). He also casts Nutty in a play that has a character dressed as a candy cane. (Debatable; it is unknown if anyone knew about Nutty's addiction at this time).
 * Rink Hijinks: He wears skis instead of skates at a roller skating rink (to be fair, possibly for balance) while wearing boxers.
 * The Way You Make Me Wheel: He shaves while driving, resulting in his death, and Handy's death as well.
 * I Get a Trick Out of You: He unintentionally suffocates a bird by keeping it in his hat, saws Cuddles' in half due to a magic trick, and later uses up the blood which Cuddles needed to survive.
 * Let It Slide: He wears Flaky's skin as a hoodie no only not noticing or ignoring the fact that it's Flaky's skin but completely neglecting to cover his lower half which is what the problem is.
 * Icy You: He somehow gets his tongue stuck in hot dog rollers and keeps working with his tongue stuck.
 * Out on a Limb: He cuts off the wrong leg which wasn't stuck under the tree instead of vice versa.
 * Remains to be Seen: He chooses a leaf blower over a chainsaw to kill the zombies. (Debatable, because Lumpy successfully defeated Flippy with said leaf blower, it really isn't stupid at all. But, considering the situation and Lumpy's luck, the chainsaw would have been a better choice. Though also given Lumpy's luck, he would have likely cut off his own limbs with the chainsaw and even if he didn't, it would have taken much longer to defeat all of the zombies.)
 * From A to Zoo: He puts in a dart the wrong direction, causing it to go down his throat and tranquilizes himself (to be fair, he may have been panicked and had no time to realize this error). He also doesn't notice a rhino's horn obviously went through Toothy's head, and mistakes a baboon for Sniffles.
 * The Wrong Side of the Tracks: He designs a roller coaster so poorly that it causes the deaths of the riders and himself. He also nails a wooden board to his ride with Mime impaled to it.
 * Don't Yank My Chain: He falls for Lifty & Shifty's foolish disguises and arrests Handy and Mole. He leaves the cell open with the keys near it. He takes several seconds to realize that Handy and Mole had gotten away. He uses part of Mole's sweater (a clue to finding them) to blow his nose.
 * Dunce Upon a Time: He sticks a fork into a plugged in toaster 3 times in order to get Flaky out.
 * Concrete Solution: Looks inside a nail gun and fires it. Then he uses a bag of sugar instead of cement to build a bridge.
 * Wishy Washy: He was walking in with his shoes dirty, then exited and came back in only to realize that there is a mat underneath him, and when Petunia chokes on a glove, Lumpy puts his plunger into Petunia's mouth in order to help her. (Debatable because between the extreme issues with Petunia's pipes and her now choking, he was in a state of panic and tried to act very quickly on impulse.)
 * Who's to Flame?: He foolishly plays with a lit match, which is ironic considering his fireman job (Debatable; he's playing in such a way that won't cause disasters. But playing with fire at all is dangerous).
 * As You Wish: He sets Cub on fire and gets him run over by a fire truck (Debatable, it really depended on how Pop worded his wish - which seems to have been for a "hot ride" - as Lumpy was able to successfully grant Nutty, Disco Bear and Sniffles' wishes.)
 * Take a Hike: He uses up all of the drinking water for shaving instead of using the water that was in the lake. Doesn't pay attention to the group enough. Takes a nearly broken bridge over a strong one (Debatable because this was out of fear, so he wasn't paying attention or didn't notice).
 * A Change of Heart: Lumpy repeatedly loses the normal-sized hearts due to lack of attention.
 * Blast from the Past: He pushes his body so hard on a seesaw that the handle impales him. Later, he repeats his act from Spin Fun Knowin' Ya.
 * Idol Curiosity: He mistakes ice in Toothy's drink for an iceberg. (However, he looked through a telescope, and the image he saw gave a wrong impression.)
 * Home Is Where the Hurt Is: He folds the blueprints of Giggles' new house into a origami crane. (Debatable; he may have just done this selfishly, looking for a replacement for his broken one). Later, he connects electrical pipes to normal pipes for the shower, which electrocutes Petunia later.
 * Aw Shucks!: He unintentionally destroyed his house while trying to kill a crow, and thought Toothy's corpse was his scarecrow.
 * Wingin' It: He uses many electronics, despite Mime telling him not too. Later, he takes all five parachutes, and then fails to properly wear even one of these parachutes, so in the end, it didn't save him.
 * Tongue in Cheek: He mistakes the skin from Sniffles' hand for a glove (even though he already has his glove and only one is required to play golf) and his organs as a mini-golf course.
 * I've Got You Under My Skin: He tries to stop Sniffles from traveling further up his body, but ends up severing his leg (Debatable; this was a weird and unexpected result to a somewhat logical attempt). He is also shown to have numerous strange items, including a plane propeller and a bear trap, inside his pockets (possibly for the numerous jobs that he has).
 * Junk in the Trunk: He takes forever to compare the elephant in Lifty & Shifty's car and the one he put on his missing elephant poster. He also chooses a pogo stick over a race car to chase after the thieves (Debatable because the pogo stick offered more versatility).
 * Hear Today, Gone Tomorrow: He doesn't realize his can was on his butt and ran to get some new things. He later tries to use a trombone as a hearing aid, tries to phone the hospital while deaf, wears a birthday hat the wrong way (Debatable because it was likely simply a difficult task to get it around his antlers), and tries to phone for help using a can telephone.
 * Double Whammy Part 1 and Part 2: He hypnotizes himself, making him act like a chicken. This is later seen in part 2, where he is inside a chicken truck trying to lay eggs. Also, in Part 1, he shows Flippy ink blobs that even to a normal person look like: a dagger, a bomb, and an explosion causing him to flip out. (Debatable, because this could have been done as a way to test what causes him to flip out.)
 * Can't Stop Coffin: He buries what was originally an empty coffin, fills the hole with water, and leaves his truck in reverse, driving it into the grave and crushing Cuddles.
 * All Flocked Up: He tries to pop his balloons with a rock, but accidentally throws it at Toothy, causing his face to land in hot tar (Debatable, because this may simply be bad aiming).
 * Something Fishy: He mistakes the bowl for Russell's Piranha as a helmet and puts it over Russell's head.
 * I Nub You: He sews Handy and Petunia together, and ends up sewing his own arms on them. (Debatable because he likely was just missing body part and was really just trying to find a way to keep them both alive and that was the only option).
 * See You Later, Elevator: He uses an elevator during a fire, which isn't safe. He tries CPR on the lower half of Cuddles' corpse, and uses too much pressure, and explodes the corpse.
 * Milk Pong: He chokes on a ball, later drinks bleach instead of milk, doesn't notice a rat in the cup (twice) (Debatable, because like with Giggles, who really looks into their drinks?), and tries to get the ball out of a wood chipper with his bare hands.
 * The Chokes on You: He eats donuts while working (Debatable; this was more lazy or selfish), and doesn't chew before swallowing.
 * Brake The Cycle: He spills too much gasoline while pouring it into his motorbike, which causes him to get burnt to death.
 * All In Vein: He leaves Giggles in the fridge for too long, causing her blood to harden (Debatable because who hasn't done this with food items?). He later drinks too much blood, causing him to go overweight and preventing him from flying.
 * No Time Like the Present: He brings Handy a pair of mittens, ironic considering his lack of hands. (Debatable; he might not have even been the one to wrap or choose the gift, or it was a mix-up).
 * You're Kraken Me Up: Instead of rescuing Russell, he saves the squid tentacle with Giggles' head on it, thinking it was Giggles. He makes a similar mistake later on by feeding a bottle of milk to Cub's head attached to a tentacle.
 * All Work and No Play: He attempts to save Nutty by jack-hammering the top of the wall, resulting in his torso getting completely mangled. Later saves Sniffles, but is distracted by Lammy, resulting in him getting smashed to pieces by the excavator's buckets closing in on his head.
 * A Vicious Cycle: He eats chips out of Disco Bear's brain. While hiding from a possessed tricycle, he bites a chip and the crunch noise blows his cover.
 * Dream Job: He messes with the television so much that Sniffles' dreams become erased and the TV turns off. (Debatable; he likely had no idea what he was doing and didn't have many ways to realize it's Sniffles' fault for making it possible for him to do this. Although he should have recognized Sniffles on TV).
 * Ski Patrol: He messes up and causes the deaths of numerous characters. (to be fair, this was mostly the narrator's fault for misinterpreting the instructions, and the fact that the narrator continues to praise him even after such mishaps).
 * Kringle Tree: He smashes Giggles' head trying to chop down a tree with an axe.
 * Kringle Feast: It takes him a long time just to start up a lighter. Then he kills himself (and others) from an explosion because he left the gas open too long while trying to light a lighter. (Debatable because to be fair, having a hard time starting a lighter isn't by itself a sign of stupidity).
 * Kringle Frosty: He skis over Sniffles and Toothy, killing them. (Debatable; he might have missed them because he plowed through their snowman, blinding his vision).
 * Strain Kringle: He throws a rock at Cuddles and Toothy, when a snowball would have been more preferable (Debatable; he could have just done this for the sake of being a jerk).
 * Seize the Day: He uses a defibrillator on Cuddles while he is having a seizure, resulting in his death.
 * Happy New Year: He crashes into Flaky and Russell, crushes Cuddles, and somehow gets the film wrapped around his body. (to be fair, though, he was in a rush).
 * Moppin Up: He forgets (or neglects) to put a Wet Floor sign while mopping, causing Sniffles to break his head. (Debatable; he was currently in the process of mopping so the sign shouldn't have been necessary, and considering that Sniffles didn't notice Lumpy mopping, he certainly wouldn't have needed the sign).

Petunia
Petunia is definitely an unintelligent character. Her intelligence is comparable to Lumpy's at times. Some of these are caused by her OCD, but more are caused by lack of recognizing problems.
 * Eyes Cold Lemonade: She nails the lemonade sign in a very sloppy matter, which leads to her own death.
 * Wishy Washy: After getting increasingly dirty trying to get clean, Petunia resorts to skinning herself alive using a potato peeler. (Debatable because she lost her stability from seeing Lumpy's corpse and because of her severe obsessive-compulsive disorder (OCD). Also, she downs a whole bottle of mouthwash, an act that could have killed her. And she attempts to breathe in a glove.
 * A Hole Lotta Love: She doesn't pay attention while driving and nearly runs over Mime.
 * Breaking Wind: Probably her most well-known blunder, she strikes a match in the middle of a gas cloud induced by Splendid. As a result, the earth is set aflame and kills presumably billions.
 * Who's to Flame?: She leans on the burning stove while talking on the phone, resulting in her tail burning. (Debatable because she wasn't paying attention, though why wouldn't she be paying attention? Or she could have just ignored the call.)
 * Peas in a Pod: She takes a very long amount of time to figure out she'd lost an arm. Later she just stands their screaming rather than attempting to run away.
 * Wingin' It: She doesn't take off her air freshener when cleaning the toilet or using the sink.
 * Home Is Where the Hurt Is: She trusts Lumpy with pipes.
 * Royal Flush: She sticks her eye up her hoover.
 * Camp Pokeneyeout: Pulls a slingshot with grape juice coving her hand making it too slippery and killing her
 * Take a Hike: She drinks contaminated water, when she could run back to the lake. (To be fair, she was dehydrated)
 * I Nub You: She lets her bird out without shutting the window, and later bowls with her body along with Handy.
 * Pitchin' Impossible: When Mole's pitching goes wrong, she simply stares rather than moving out of the way.
 * Dream Job: She doesn't know the cause for Sniffles's traumatizing experience, and carts him over to the telly. (Debatable)

Handy
Handy doesn't make as many mistakes as others. In fact, he's one of the most intelligent characters, but even he has his moments.
 * Home Is Where the Hurt Is: Was it his idea to invite Lumpy to build Giggles' home? (Debatable because he wasn't involved in the discussion on what to do so he might have been there by chance.)
 * Don't Yank My Chain: He trusts Mole to use a mallet to hit a chisel he held between his teeth. He also could have looked for someone working at the sawmill to remove his chains. Instead, he attempts to cut off the chains using a train. (Debatable because he might have looked off screen and found no one and, in real life a train would've broken the chain instead of dragging it.)
 * Shard at Work: Fails to notice where he's walking, resulting in him stepping on a glass shard. Also attempts to change his lightbulb using his teeth when he could have gotten help doing it.
 * I Nub You: Bowls with his body along with Petunia, which results in them being horribly mutilated.

Sniffles
Despite being considered by most as one of the most intelligent characters in the series, Sniffles has made many illogical mistakes. Some derive from his complicated inventions, which are plagued with oversights Sniffles doesn't notice until it is too late.
 * Spare Me: Attempts to toss a bowling ball using his snout, leading his head to be torn off.
 * Tongue Twister Trouble: Uses his tongue to catch an ant on ice, which would have stuck to the ice even if the ant hadn't moved.
 * Happy Trails Pt. 2: Jumping the Shark: He designs a rocket so strong it can go all the way to the sun and cannot be stopped from this course.
 * Suck It Up: He gives his invention a flexible nozzle which can get stuck to the side of his head with the other side still attached to his face. He also doesn't try to remove it from his face at any point during the torture session.
 * His Smoochie: Since he invented the growth serum, he should have known its effects and not have drank it. Rather he should have poured it on his body if he wanted to grow himself.
 * Party Animal: He uses a barrel filled with water as a hiding spot, almost causing him to drown, instead of simply running out of the house. (Debatable, as he was panicking)
 * Who's to Flame?: He also uses a wood ladder to get to the window of a house that the fire's clearly too dangerous to do so.
 * Every Litter Bit Hurts: He just watches as The Mole stabs his foot with a litter pick not making any attempt to move his foot.
 * Take a Hike: He runs around randomly while on fire instead of stopping, dropping, and rolling on the ground or heading for the lake.
 * A Hole Lotta Love: He lets the Mole make and lead with the map. He designs a lookout post that isn't shatter-proof, causing Mole's head to burst.
 * Dunce Upon a Time: He visibly and audibly moves in his hiding spot, giving his location away to Giant Lumpy.
 * Blast from the Past: After dropping a glass of milk, Sniffles decides to build a time machine rather than cleaning up the mess, and replacing the glass of milk. In doing so, leads him to create various time anomalies. He also shouldn't have landed the plane in the park.
 * Concrete Solution: Carrying Nutty in an ambulance, Sniffles forgets to strap down his patient's gurney. He finally attempts to do so while still driving his vehicle, causing a crash as well as his fate.
 * Mime to Five: He goes in water too deep for him to touch the bottom.
 * Idol Curiosity: He keeps carrying the idol with him despite seeing all the disaster it's causing. Later, he tries to stop an earthquake by barricading the door and throwing stuff in it.
 * In a Jam: He shoves cymbals in Handy's mouth when he was having a seizure leading to his death. (Debatable, because Sniffles placed the cymbals in Handy's mouth to prevent him from biting his tongue off). With his medical experience, he should have known that he was supposed to take away his hammer and screwdriver so he doesn't get hurt from them, turn off the strobe lights, and wait it out.
 * Wingin' It: Being the only pilot operating a plane, it was rather unwise of him to encounter Lumpy personally. He could has simply spoken to Lumpy via speaker.
 * Tongue in Cheek: Even after being painfully tortured once in the episode, Sniffles' determination to eat the Ants consumes him, and he tries to use a mind-control helmet and robot to do the job. The Ants once again get the upper hand and kill him in a gruesome, agonizing ways. This happens in other episodes but the show's lack of continuity isn't here to justify it.
 * I've Got You Under My Skin: Despite staring right at her (unlike Lumpy who was understandably focused on the door), he takes a long to to realize he's looking at Giggles buried in the snow. Considering his intelligence, Sniffles could have helped Giggles by taking her to a hospital, instead uses a shrinking submarine, that comes with a timer indicating how long he will stay microscopic (which he could have turned back to keep himself that size until the job was done, which he never does). He flew right through Lumpy's optic nerve instead of around it. Also, when he climbs out of the machine, he steps on the timer shrinking it on himself. Lastly, he crawls for a first-aid kit for help, despite how incredibly severe his injury was.
 * Wrath of Con: He keeps his ticket in his pocket when it's supposed to be around his neck and forgets it's there. He asks Splendid for an autograph while Splendid was busy holding up a chunk of debris. To be fair, this could also count as part of Splendid's accord.
 * Happy Tree Friends: False Alarm (episode): Either gives or lets Nutty take a chainsaw into his padded cell (Debatable; he may not have done that and it could have been for psychological examination).
 * Peas in a Pod: He blatantly walks right into a Pod Lumpy and the Blurb points out, he would have walked into the wall if it wasn't there.
 * Something Fishy: He puts his hamster right next to Russell's piranha. (debatable) He also doesn't even notice the fishbowl on Russell's head instead of the helmet.
 * Random Acts of Silence: Despite there not being an emergency, he and Nutty try to sneak out the fire exit, then, when the alarm goes off they don't even exit, but instead stand there and stare.
 * All Work and No Play: Sniffles, along with Lammy and Nutty, decide to play on a playground that is clearly under demolition. In particular, Sniffles goes down a slide despite it having holes in it, causing his body to be grated like cheese and slides right into wet cement.
 * Buns of Steal: He rides his bike in the middle of the road, which is both unsafe and illegal, leading to his death.
 * Pet Peeve: He brings the Blob out in public and lets it hump Lumpy's leg, despite knowing the danger. Finally, similar to Concrete Solution, Sniffles does something without stopping the car first. In this case, checking on his pet after it makes a hole through the floor. This sends the vehicle into a sidewalk where his head is sliced off.
 * Spare Tire: He tries to revive a long-dead Giggles by replacing her missing middle with a tire. Note that, although the heart rate monitor started, the air could have just pushed some of her blood into artificial circulation. (Debatable)
 * Dream Job: He had designed his dream machine where it was possible for someone else (case in point Lumpy) to change his dreams by simply flipping through channels with a TV remote.
 * Moppin Up: With a big puddle visible on the floor (and Lumpy in the process of mopping it), Sniffles should have watched where he was going or walked more carefully.

Nutty
Nutty has done many things that endanger his and others' lives, mostly because of his candy addiction and the fact that he always acts before he thinks.
 * Class Act: The entire fiasco all started when Nutty bit a chunk off Sniffles' body, dressed in a candy cane costume.
 * Stealing the Spotlight: Seeing a string of Christmas lights as candy, Nutty swallows them and gets disemboweled by Lumpy as a result.
 * Concrete Solution: Hanging onto the edge of a bridge for dear life, Nutty begins eating it after realizing it is made of sugar. It comes to the point where he bites off one last bit of the bridge holding two halves together, leading him to be violently ripped in two.
 * Chew Said a Mouthful: Fractures his jaw trying to bite a jawbreaker, cuts his braces loose, and causes several deaths (including his own) in an attempt to get the confection back.
 * Wipe Out: After dropping his ice cream into a tidal pool, he mistakenly puts a sea urchin into his cone and bites into it.
 * A Sucker for Love: Upon bashing a gumball machine open, Nutty places a handful of gumballs into his mouth, along with shards of glass. He gets his teeth and gums cut, followed by his face when he blows a gum bubble.
 * Random Acts of Silence: Despite there not being an emergency, he and Sniffles try to sneak out the fire exit, then, when the alarm goes off they don't even exit, but instead stand there and stare. Later when Sniffles is killed he just panics rather than running off.
 * All Work and No Play: Nutty, along with Lammy and Sniffles, decide to play on a playground that is clearly still under demolition. In particular, Nutty rides on a swing-set located dangerously close to a bunch of large nails, to which he gets impaled on.

Pop
Almost earning a reputation similar to that of Lumpy, Pop's stupidity derives from his incompetent parenting, usually the cause of most of Cub's deaths and injuries.
 * Snip Snip Hooray!: He accidentally cuts off one of Cub's ears with scissors. Then he leaves Cub unattended with an electric shaver, paying no attention as Cub puts the item in his mouth as he activates it. He is oblivious to Cub's following death.
 * Water Way to Go: He buries Cub in sand from the neck down and leaves him to get ice cream. Cub then gets submerged in high tide and Pop believes his son has been washed out to sea. He brings a boat on the water, running over Cub's head and ultimately shredding him to death with the motor.
 * Stealing the Spotlight: He shoves Cub's tooth through his upper lip instead of back into his gums. (Debatable, because the tooth wouldn't stay in his gums)
 * And the Kitchen Sink: He sends Cub rolling down a hill in a wagon, goes through a garden of cacti instead of around it, leaves Cub unattended in the sink until his fur is burnt off, almost kills Cub by activating the garbage disposal, breaks one of Cub's bones, almost kills him again by using his car, and drowns him by once again leaving him unattended.
 * Every Litter Bit Hurts: He fails to notice Cub choking on litter and mistakes his remains for trash.
 * Read 'em and Weep: Kills Cub after he is turned back to his normal self after The Demon that possessed him was removed by Lumpy.
 * See You Later, Elevator: Pop tosses a lit match out a window, which gets blown into the lower floor and creates a fire.
 * Clause For Concern: In a post-credits scene, Pop crushes Cub by closing a door on him. (Debatable because he didn't know Cub was right behind the door.)
 * Bottled Up Inside: Stops in the middle of a crosswalk to pick up a coin, allowing Cub and much of the stroller to be hit by Russell's car, to which he remains completely oblivious. He is also oblivious that his water container has Russell's corpse in it, and fills a cup with his blood.

Cub
Cub's stupidity is excusable, since he is very young and is naïve about the concept of death.
 * Rink Hijinks: He rips Lumpy's heart out using a claw in a toy machine, then hugs the organ thinking it is a toy.
 * Cubtron Z: After being reincarnated into a giant robot, he uses Cuddles, Giggles and Petunia as crayons to draw on a building.

Flaky
In contrast to the blissful ignorance of most characters, Flaky is known for being very cautious about her surroundings, thus she can be considered as one of the wiser characters. But even she has made mistakes.
 * Happy Trails Pt. 2: Jumping the Shark: She completely forgets that she's a porcupine and leans back against the inflatable life raft popping it.
 * Let It Slide: Considering her fear of water, why did she even go to a water park in the first place?
 * Dunce Upon a Time: She chooses a toaster as her hiding spot setting the likelihood to be either intentionally or accidently burned to death. She also visibly and audibly moves in this hiding spot giving away her location to Giant Lumpy.
 * A Change of Heart: Plays goalie during a soccer game, despite her being afraid of objects flying towards her. (Debatable, as she may have wanted to play soccer but all of the other spots on the team were taken, but then again she appeared to be afraid of the ball.)
 * Wipe Out: As in Let It Slide, it is hard to imagine why she entered the surfing contest in the first place. Perhaps she wanted to try being brave.
 * Without A Hitch: Let's her hallucinations distract her from driving, causing her to crash into a pole.
 * The Chokes On You: Somehow doesn't notice that the "doughnut" she had got was Lumpy's flesh. Like Lumpy did earlier in this episode, she swallows a doughnut without chewing it first. She ends up choking and possibly dies.

The Mole
Some may consider the Mole's actions acceptable since he is blind. But there are times this rule won't apply.
 * Spare Me: He doesn't wonder what's blocking the holes in his "bowling ball", instead roughly jamming his fingers right through Sniffles' glasses.
 * Blind Date: He can't tell the difference between a dead Lumpy and Giggles besides many non-visual indicators such as heat, size, and voice before death.
 * Who's to Flame?: Fire hydrates don't just flip open like the valve for a gas tank so he should have questioned that.
 * In a Jam: Despite Cuddles informing him about a mistake (giving a button instead of money), he makes Cuddles donate again. He doesn't find it weird that a chair was suddenly where his patient laid, and proceeded to sit on Cuddles' corpse.
 * Wipe Out: Shreds Lumpy to death and carves his body into a surfboard. While apparently unable to see, the Mole should have at least heard Lumpy's screams of pain.
 * Autopsy Turvy (Double Whammy Part II): When he cut his foot on the broken glass on the floor, he questions it briefly but just moves on instead of picking up what he cut himself on. (Debatable)
 * Can't Stop Coffin: He doesn't notice the difference in taste between an apple and an eyeball.

Mime
Mime has caused quite a few of these, with at least one popular case.
 * Mime and Mime Again: He could have simply turned the fan off before Toothy got sliced apart and died.
 * Easy For You to Sleigh: Somehow doesn't notice Lifty and Shifty are watching him, despite the fact that they aren't even hiding.
 * Who's to Flame?: Assuming he could talk, why did he mimic talking on the telephone, instead of actually talking? And even if he can't, why use the phone in the first place?
 * Dunce Upon a Time: Stays in the broken jar even when about to be stepped on.
 * Mime To Five: Takes a job at a drive-thru window even though he can only mimic talking. His mime instincts once again get in the way, when he mimics trying to save an imaginary person drowning, and letting Sniffles drown.
 * Something Fishy: He also doesn't even notice the fishbowl is on Russell's head instead of the helmet.

Disco Bear
Disco Bear's intelligence is likely not very high. An early gag consisted of him accidentally killing girls and thinking their suffering was a type of dance move.
 * Stayin' Alive: Disco Bear tosses Giggles into scalding hot tea and Petunia into an electric fence, and obliviously dances to their movements of pain.
 * Who's to Flame?: He drives off in the engine with Cuddles still up on the lift. He also activates the fire hose despite that he was looking was should have seen that it was attached to the gas tank instead of the fire hydrant.
 * A Change of Heart: Eats an entire stick of fried butter, resulting in a heart attack.
 * Aw Shucks!: He is completely unaware that Giggles has been hit by a chunk of popcorn, and believes that the popcorn that hit her is an afro. He then proceeds to kiss her before being killed himself.
 * Easy Comb, Easy Go: He sticks his head inside a cotton candy machine. He leaves the back of the van open, which causes bottles of hair growth formula to fall out. He sticks his entire head in the formula instead of just pouring it on top. Finally, he cuts off his eyes with a straight razor.
 * Put Your Back Into It: After his spine bursts out of his body, Disco Bear tries to fix it using duct tape, as opposed to calling for an ambulance.

Russell
Russell's intelligence doesn't seem to be that high. In fact, it could be comparable to Lumpy's at times. However, some of these may be justified due to Russell's vision problems (seen in A Sight for Sore Eyes).
 * Whose Line Is It Anyway?: He swallows a live puffer fish and it inflates in his throat. (to be fair, he wasn't looking)
 * In a Jam: Strums an electric guitar while a glass of water lays on top of an audio box. Knocking over the glass, Russell ends up being electrocuted to death.
 * Something Fishy: He doesn't realize that Lumpy put the fish's bowl over his head until it is too late.
 * Bottled Up Inside: After a glass bottle impales his chest, Russell pushes it further into his body just to fit into his car. He doesn't adjust his seat, preventing the driver's wheel from turning because of the bottle. Also instead of simply stopping his car and walking to the hospital he keeps driving forward.
 * You're Kraken Me Up: He is completely oblivious that Giggles' head was torn off and placed on a giant squid's tentacle.
 * Put Your Back Into It: Rips out Disco Bear's spine and head, thinks he's caught a fish, and cooks the remains for a dinner date. It also makes very little sense why he was casting his fishing rod at the beach instead of towards the ocean.

Lifty
Despite being considered by most as pretty much the same character, Lifty seems to have more of the brains for the raccoon duo but he still make mistakes, usually along with Shifty though.
 * Wheelin' and Dealin': Doesn't notice until the race is about to start that their cart didn't have wheels or that it didn't have a steering wheel until one was needed despite having presumably made the cart with Shifty.
 * Meat Me for Lunch: He and Shifty keep a shoe in their fridge.
 * And the Kitchen Sink: He along with Shifty notice Pop's car coming in their direction but they make no effort in moving out of the way.
 * Easy For You to Sleigh: He and Shifty try to rob Flippy, despite seeming to know about his mental problems by their uncharacteristic paranoia at first, and instinct to tie him up. He also blindly trusts the directions out the window without looking for himself which, even if it actually was Shifty giving them, was a bad move.
 * Doggone It: Tries to tug a dollar bill from Shifty's hand instead of letting him focus on driving.
 * Don't Yank My Chain: He and Shifty steal a car that was about to be filled up with gas, and expecting it to get far with it. Also they stay in the car when it's on train tracks even when the boom gates go down.
 * Junk in the Trunk: He holds a mouse in front of Lumpy's Elephant even though elephants are afraid of mice.

Shifty
Shifty, unlike his brother, seems to have an a very low intelligence level, and causes way more mistakes than Lifty.
 * Wheelin' and Dealin': He builds a race car without wheels or a steering wheel and when Lifty asked him where the wheels are responds with "Huh?" seeming like he didn't know that cars need wheels.
 * Meat Me for Lunch: They keep a shoe in the fridge.
 * Milkin' It: He jumps up and down in hot air balloon, causing him to fall through it.
 * Class Act: After the fire, he is shown trying to drag an injured Lifty to an unknown location by his ears.
 * And the Kitchen Sink: He along with Lifty notice Pop's car coming in their direction but they make no effort in moving out of the way.
 * Easy For You to Sleigh: He and Lifty try to rob Flippy, despite seeming to know about his mental problems by their uncharacteristic paranoia at first, and instinct to tie him up. Also, he alone goes back to retrieve the bag of sand that was there to stop the bear trap from cutting his arm off.
 * Doggone It: He focuses on a tug of war with Lifty over a dollar bill instead of driving.
 * Don't Yank My Chain: He and Lifty steal a car that was about to be filled up with gas, expecting it to get far. Also they stay in the car when it's on train tracks even when the boom gates go down.
 * Swelter Skelter: He tries to return the fire on his hands to the blowtorch blowing it up.
 * Buns of Steal: He rivets Lifty's foot to the van presumably to save him when it would have been better for Lifty to jump into Mole's van. Instead of staying in his van he walks on Lifty's vein just to kick Lifty's head off. He also doesn't go somewhere else to eat the bun.

Cro-Marmot
Due to his body being encased in ice, Cro-Marmot has made almost no actions, dumb or otherwise. It could be argued that he is intelligent, as he is capable of moving and surfing, among other talents, despite the fact he is currently frozen. The only case of his stupidity would be the one instance before he became frozen.
 * Dino-Sore Days: He bites into the tail of a live dinosaur thinking it was part of the carcass he was about to dine on.

Splendid
Under a similar light to Pop and Lumpy, Splendid frequently screws up his superhero duty, often making things much worse. This is due to putting his own needs first or simply out of dumb decisions.
 * Helping Helps: He flies into a branch and which causes Giggles to be decapitated.
 * Better Off Bread: He catches a falling Giggles but fractures her back in the process. He flies so fast that her eyes become detach from her sockets, and he presumably kills a seal and two gulls in an oil spill. Then he flies into space to blow up an asteroid, still carrying Giggles and skinning her face.
 * It's a Snap: He unknowingly sends a bear trap into Cub's head and decapitates Lumpy with his laser vision.
 * From Hero to Eternity: Trying to save Cuddles through mouth-to-mouth resuscitation, he blows the rabbit to pieces and deafens Giggles. Soon he cuts a giant snowball in two, killing Toothy and Petunia, who were inside it. He then whacks it away with a tree, not checking to see if anyone was in the tree house. He doesn't remove Lumpy from a truck before using it to stop the other snowball. This plan ends in the town being flooded and several characters sinking to their deaths in a whirlpool. And he kills Cub by putting him in a dryer, not checking to see him inside his laundry basket.
 * See What Develops: He fails to save Handy and Mime simply because he had nowhere to change out of his disguise. Then he mistakenly attacks Giggles, thinking she was the Mole. He flies off so fast that Giggles and a nearby Toothy are shredded. Finally, he freezes Cuddles with ice breath and breaks him in an attempt to thaw him out.
 * Wrath of Con: He sends a pencil tip through the heads of Russell, Disco Bear and Mime. Then he accidentally deafens, suffocates and kills a crowd of fans, also destroying the convention center. Finally, he gets Sniffles crushed with a chunk of debris, which he could have tossed aside before agreeing to give him an autograph.
 * Breaking Wind: After tying Lumpy to a microphone cord, it gets caught around his leg and he squeezes Lumpy to death. Then he flies through Cuddles, does nothing to save the victims of the tornado, and dooms the entire planet because of his book pages. The wise decision would have been to leave the book at home.

Flippy/Fliqpy
Similar to Handy, both sides of Flippy are less prone to make stupid mistakes. This could likely be because of his age and experience in the military but he does have a few.
 * Party Animal: Drinks Mime's liquefied remains even though it's the color of blood and he used one of Mime's antlers to stir it. Also, despite the amount of carnage in the room, Flippy doesn't even seem to notice (or even care about) the gore around him.
 * Hear Today, Gone Tomorrow: Fliqpy rings on Lumpy's doorbell and waits for the moose to answer, taking so long that he leaves. He could have just burst in through the door and killed Lumpy anyways. Doesn't make any attempt to move out of the way of the swinging log which would have hit him even if it had hit Lumpy first.
 * Double Whammy Part I: Good Flippy gives Handy a foam finger, not noticing his obvious disability.
 * Operation: Tiger Bomb: Throws a slice of pizza instead of a knife at the Tiger General. (To be fair, he wasn't looking)

Lammy
Despite her newness to the show, Lammy has already proven herself capable of making many stupid mistakes.
 * Every Episode She Stars, is Featured, or Appears in: Carries with her a serial killer or who she believes is one, even though every time he does something bad she gets blamed for the crimes. (debatable, because she may fear what he'd do if left alone and feel it her duty to be there to stop him.)
 * Royal Flush: She never notices that a certain pickle just crawled into one of the sandwiches she was about to serve when she should have at least seen his inanimate form.
 * You're Kraken Me Up: She doesn't see the tentacle controlling Giggles even cheering when Lumpy "saves" her.
 * All Work and No Play: She, along with Nutty and Sniffles, decide to play on a playground that is under demolition.