- Bee Movie: Layton: "This is an unholy perversion of the balance of nature, Benson! You'll regret this." Needless to say, the defense attorney was absolutely right, as Benson's victory did upset the balance of nature. Fortunately, Benson did fix it before it became irreversible.
- In The Black Cauldron, after Taran and his friends first escape the Horned King, they seek out the Black Cauldron and eventually find it in the home of the three witches—which plays right into the Horned King's hands, as he simply has his minions trail the heroes and take the Cauldron.
- The Brave Little Toaster: After learning that the abandoned house they were left in is now for sale, five appliances head out to reunite with their "master" and go through numerous perils trying to find him. However, their now-grown up "master" is heading to college, and he returns back to his old home to pick up some of the leftover stuff to use at his dorm (namely, them) roughly about two days after they left. They could have avoided all the trouble they went through if they had just listened to Kirby the vacuum cleaner earlier and stayed at the house.
- In Brother Bear, the central point of the story is that Kenai pursues and kills a bear he blames for his brother's death. Later on, he realizes to his horror that was Koda's mother.
- The Lorax: The Once-ler starts off with good intentions when he makes the Thneeds, like not polluting the water, not clear-cutting everything, not consuming all the food, and not terraforming the forest into a wasteland. Now......
- Made even more significant when he didn't have to chop all the trees down in the first place. All the harvesting was at the top meaning the wood wasn't needed at all, unless it was the material to build the industry.
- Monsters, Inc.: Sulley reports Randall's crimes to Mr. Waternoose, who promises to set things right for them by sending Boo back home. However, Mr. Waternoose sends in the wrong door. Mike points this out to him and he replies that he knows. Just then, Randall appears and opens the door as Mr. Waternoose proclaims it is for Sulley and Mike and pushes them through the door out into the Himalayas. Randall and Mr. Waternoose were secretly working together the entire time.
- Mulan's grandmother gives her a cricket to give her luck in order to help her with the matchmaker. While Mulan wasn't performing well to start with, it's obvious that the cricket ends up being a main direct cause for her failing the matchmaking.
- In the snow mountains, Mushu accidentally fires a rocket in the sky, revealing the heroes' locations to the Huns, which gives them some advantage in their fight. Good thing Mulan found a way to turn the tides to their favor...
- In 9, the title character's newfound friends take out the mechanical beast who had been threatening them, only for 9 to realize that the MacGuffin he'd woken up with fit perfectly inside a larger machine nearby. Said machine proceeds to kill 2 immediately, followed by 8, 5, 6, and 1 before it's all done.
- Not only that, but what he did was exactly what said mechanical beastie was trying to do not five minutes before. Too Dumb to Live.
- Also, the Stitchpunks blowing up the factory. Beforehand the Fabrication Machine had been Sealed Evil in a Can, being confined to said factory. However, instead of being destroyed in the explosion, the Fabrication Machine was essentially freed and proceeded to chase after the Stitchpunks itself, leading to the deaths of 5, 6, and 1.
- Wreck-It Ralph: The Nicelanders' behavior towards Ralph makes him leave the game to try to prove that he could be a good guy, which almost gets their game shut down.
- Ralph's own game-hopping almost gets Sugar Rush devoured by a horde of Cy-bugs, and turns Big Bad Turbo into a One-Winged Angel capable of taking down the whole arcade. The latter even calls him out, gloatingly thanking him for it. He fixes both these mistakes by atomising them in a Mentos-Diet Soda eruption.
- In Kung Fu Panda 2, if Po had not entered Lord Shen's weapon foundry against the advice of Tigress, then the Furious Five's plan to blow up Lord Shen's cannons would have succeeded without a hitch. Instead, they had to get rid of their explosives or Po would be blown up along with Shen and the Mooks. Not only that but Shen managed to shoot Po with his largest cannon, and he would have died if the Soothsayer hadn't found him unconsious in the river.
- And in the first film, Shifu, having seen Tai Lung's escape in a vision, send the goose Zeng to check and make sure Tai Lung's prison is secure. While there, Zeng accidentally drops a feather, which Tai Lung uses to pick the locks binding him and escape.
- In Justice League: Doom, Batman's Crazy-Prepared status finally gets them into trouble when a team of villains decide to steal a bunch of data from his computer, specifically, the weaknesses of the Justice League.Batman: Alfred, get the Batwing ready! The Justice League is under attack!
Alfred: By whom?
Batman: By me!
- Aladdin tricking Jafar into becoming a genie saved the day in Aladdin. But when he gets loose in Aladdin: The Return of Jafar, Aladdin's created a foe with all of the Genie's powers and none of the morals. Although at the same time, some of the threat is gone because genies can't kill, but you'd be surprised at what you can live through.
- In Hercules, Hercules frees two boys but unwittingly releases the Hydra. But after trying to defeat it by after cutting head off, three more heads grow in its place. This creates a problem after cutting so many times where there's a swarm of heads.
- The Little Mermaid: Ariel's failed Deal with the Devil allows Ursula to gain access to King Triton's trident, unintentionally dooming her civilization.
- King Triton letting his temper get the better of him and destroying his daughter's grotto was what led to Ariel running away and making that deal with Ursula in the first place, mind you.
- The Little Mermaid II: Return to the Sea: Ariel refusing to tell Melody about her merfolk heritage and her reason of not allowing her to explore the sea is what sets the plot in motion.
- Melody, for not handing over the trident to Ariel and giving it to Morgana.
- Frozen: After Elsa accidentally struck Anna with her powers, their parents kept them apart and isolated her in her room; however, being isolated and fearing her powers is the reason Elsa can't control them.
- Anna, after she informs Elsa of the Endless Winter she's created. The "breaking it" part is that she will not stop talking (how she's trying to help), which further drives Elsa into having a panic attack.
- Shrek 4-D: Fiona tosses a grappling hook at a rock in an attempt to stop the raft she's on from going over a waterfall, but when Shrek and Donkey show up to save her, they jump on the raft. The added weight causes the grappling hook to snap.
- In The SpongeBob Movie: Sponge Out of Water, when SpongeBob and Plankton watch the cosmos for Bubbles, Jupiter ends up crashing into Saturn. This causes Bubbles to get fired and become aggressive toward the duo. However, it's subverted later, when Bubbles reveals that he hated his job; he rewards the heroes by granting them the ability to breathe above water.
- Basil and Dawson are in Ratigan's Death Trap in The Great Mouse Detective. The Death Trap has fortunately been foiled by the broken record. Dawson bellows out his "Pull Yourself Together!", and causes the record needle to jump past the broken spot, thereby starting the Death Trap up again — ironically "breaking it" by fixing it. Further ironically, this has been cited as a Moment of Awesome for Dawson.
- Moana: Maui stealing the heart of Te Fiti results in her becoming her Superpowered Evil Side.
- Beauty and the Beast:
- Maurice is caught by the enraged Beast who is on the verge of throwing Maurice out, not caring about the fact that wolves would've eaten Maurice. But when Maurice claims he needs a place to stay [for a night], he unintentionally prompts the Beast to irrevocably imprison him in retaliation when ''he's'' the one who didn't want Maurice or any trespassers in the castle in the first place.
- When Gaston is about to have Maurice sent to an insane asylum because of his story about the Beast, Belle uses the magic mirror she brought from the castle to show the Beast to all the villagers, as proof of her father's sanity. But the Beast's fearsome appearance terrifies the villagers, and even Belle's attempt to assure them of his kindness makes things worse, as Gaston realizes her romantic feelings for him, and out of jealousy he leads the crowd in storming the castle to kill the "dangerous" Beast.
- In My Little Pony: Equestria Girls Legend of Everfree, Rarity tries to reason with the Big Bad (who's dead-set on keeping everyone at the camp forever) by mentioning how she'd miss her weekly trips to the spa. Sadly, this turns out to be the Big Bad's Berserk Button. Whoops.
- The Incredibles:
- Before his FaceHeel Turn, it was Syndrome's first attempt at being heroic. When attempting to get the police, Bomb Voyage slyly puts a bomb on his cape, forcing Mr. Incredible to abandon Bomb Voyage and save him. This not only causes Bomb Voyage to escape, but for innocent civilians to get seriously injured while riding a train (the bomb destroyed the train tracks). This then leads to several events & lawsuits against the supers and the Supers Registration Act. After all this, Syndrome had the gall to play the victim.
- Helen activating the homing device, causing Syndrome to find out where Mr. Incredible was located.
- 101 Dalmatians II: Patch's London Adventure: Patch appearing as the lucky dog in the front page headliner photo at the Thunderbolt audition unfortunately ends up biting him, as reading the Ratcliffe's new address on his collar from the photo allows Cruella De Vil to know where Anita and Roger moved to and steal the puppies once again. She even sadistically thanks him when he appears at her warehouse to rescue the other puppies.Cruella: Well, well, well. What do we have here? Oh, it's you! (chuckles) I owe you a debt of gratitude, my photogenic little friend. If it wasn't for you, I'd have never found your brothers and sisters! And now I have you all! (cackles evilly)
- The Jetlag Productions version of Sleeping Beauty adds this twist to the story. After princess Felicity pricks her finger and falls under the evil fairy Odelia's curse, Odelia actually thanks Primrose, the fairy who altered her death curse, for setting it up. Odelia explains that she just wanted to kill Felicity, but Primrose has made it so that Felicity will remain unchanged for a hundred years, and when she wakes up, everyone she ever knew and loved will have been long dead. Conversely, Felicity's parents are left to moan that they're going to die knowing their daughter will be all alone when she wakes up, as they grow older she won't age a day.
- In the Direct To DVD film Tinkerbell, Tink's reckless actions ruin all of the fairies' preparations for spring, threatening to cause a chain reaction that disrupts all the seasons, which would result in an ecological catastrophe. Only her brilliant inventions get the fairies back on schedule.
- A lot of the plot for Teen Titans Go! vs. Teen Titans is caused by Gentleman Ghost hopping into 2013 Raven's mind and breaking her mental gem holding her demon side.
- As in the comic it's based on, the altered timeline in Justice League: The Flashpoint Paradox is the result of The Flash messing with time to keep his mother from dying. Oh, and as Justice League Dark: Apokolips War shows, it kept getting worse as it's revealed there that Darkseid's interest in Earth, first shown in Justice League: War was caused by Barry's actions — and the majority of Apokolips War takes place in a Bad Future where a lot of Earth's heroes are either dead or converted into The New 52: Future's End-style cyborgs, Earth has suffered irreparable damage, and the Pyrrhic Victory was to such a degree that Barry has to go back again to try to fix things.
- In Coco, by banning music from her household and erasing Hector from their family photo, Imelda inavertedly allowed Ernesto to go unpunished for not only murdering Hector but also stealing his music ensuring that Ernesto will never be exposed as murderer and fraud.
Nice Job Breaking It Hero / Animated Films