Young Carl, determined to impress Ellie, attempts to walk across a wooden beam to retrieve his balloon. He takes a single step. The beam promptly breaks.
The reason Russell is collecting badges is that he hopes his deadbeat father would finally show up at his final Wilderness Explorer ceremony. His father still never showed up. But we are treated to a heartwarming scene between Russell and Carl, who became a father figure to him.
Early on, when Carl hits the man who knocked over his mailbox in the head with his cane, the man is seriously injured and bleeding, and Carl gets into legal trouble.
Mr. Incredible saves a suicidal man, who promptly sues him for the injuries he caused. He stops a runaway train, and is sued for damages. Holding superheroes responsible for the collateral damage they inadvertantly cause is the reason they disappear. (This one is Hollywood Law though, in real life there are laws specifically preventing such suits.)
Mr. Incredible's interrupting Syndrome's We Will Meet Again by taking a pot-shot at him with a thrown car.
Syndrome trying to be a superhero with just fancy gadgets. It goes horribly wrong because while he does know how to use the weapons he has, his nerves get the better of him the moment something doesn't go according to plan, namely his robot "opponent" recognizes him as a genuine threat and takes out the failsafe shutdown.
Merida abuses a loophole so that she can get out of an arranged marriage. Not only does this cause a massive argument with Queen Elinor (leading to Merida's bow getting burnt and her running away), the humiliation of sons of the various clan lords royally pisses the clan lords off, and almost causes a war. In short, the Loophole Abuse made everything worse.
Merida the skilled archer shoots at the bear Mor'du and hits him... to little or no effect. Annoying Arrows is a reality when the bow is light enough to be drawn by an average-sized teenage girl, however strong she may be, and the target is an unbelievably massive bear.
In the animated film Wizards, good wizard Avatar confronts his Evil Twin Blackwolf. At first everything seems to set up for a Wizard's Duel. Then Avatar, who up to this point has been a pacifist, suddenly pulls a gun and shoots Blackwolf dead, adding "I'm glad you changed your name, you son of a bitch!"
After everything seems set for a Happily Ever After, it gets derailed into more of a Bittersweet Ending. Despite everyone's efforts to revive Gusteau's, it's shut down for good when the Health Inspector is entirely unmoved by the fact that the rats in the kitchen are perfectly sanitary and are cooking the food. Remy, Linguini, and Colette do bounce back and open up another restaurant, though, keeping it from falling into a full Downer Ending.
Linguini reveals his secret to the kitchen, only to have everyone, even the waiter and his girlfriend, all walk out due to feeling betrayed, with only the latter (the only one he was really emotionally connected to) choosing to come back.
In Megamind, Titan/Hal initially thought that his powers would be able to impress Roxanne and that saving her would be enough to make Roxanne fall in love with him. But when he finds out that real women don't work like that, he doesn't take it well.
In Monsters University, Mike and Sulley are both expelled from the school. But then they perform a feat the likes of which the school has never seen. The result? They still get expelled.
At first, Sulley impresses all the teachers with his natural scaring ability. But because he didn't spend any time studying, when he is properly evaluated, he finds that a single great roar can't account for every child.
Also, Mike clearly has passion and knowledge for Scaring, but he lacked a certain spark and finds himself expelled alongside Sulley from the Scaring School.
In Looney Tunes: Back in Action, as the spy car is falling with our heroes inside, the car freezes just inches from the ground because it ran out of gas. Just as the scene starts to fade out, Kate mentions it doesn't work like that and the car suddenly smashes against the ground.
In Superman vs. the Elite, Manchester Black issued a referendum to all superheroes on Earth that, after he and his team kill Superman, they'll not hesitate to kill anyone who tries to bring them to "justice." Reality ensues when Black and the Elite are seemingly massacred by a morally-unrestrained Superman, who is effectively elevated to the status of a Physical God when he isn't devoting just as much effort to protecting the lives of others while trying to nonlethally neutralize his enemies.
During the final confrontation, Superman performs a mini-lobotomy on Black with his Eye Beams, removing his Psychic Abilities. Supes then calmly walks over and bitch-slaps him a few times, with Black collapsing to his knees afterwards. It turns out that Black is useless without his powers.
In Justice League: The Flashpoint Paradox — and the original Comic Book version, perhaps — Barry Allen's attempt to replicate the accident that turned him into The Flash on purpose instead ends up leaving him with third-degree burns across his entire body. Zigzagged in that the second time, it works.
A heartbreaking example in The Land Before Time: The Great Long-Neck Migration; no, Mr. Littlefoot's long lost father, your son is not going to instantly accept you and have a happy, loving reunion with you upon learning that you're his father. He's going to be hurt and upset that you were never there for him his entire life and that he never knew where you were or if you were even alive. Fortunately, this one is remedied pretty quickly.
Chicken Run. Sorry Fowler, the RAF doesn't allow chickens to pilot aircraft. Amusingly he had thought this too obvious to mention, and the confusion comes from other characters not spotting it.
Quasimodo's attraction to Esmeralda ends up being unrequited. Because even though she has it in her to accept him as a friend and a good person in spite of his less than attractive physical features, he is not the one she loves romantically.
Even though Esmeralda is saved from the stake by Quasimodo she does not get off scot-free. In the film she nearly dies from smoke inhalation and in the stage adaptation Der Glockner von Notre Dame, she does die.
Frollo's death. Turns out standing on a very narrow perch while swinging a sword around does not do wonders for one's physical health, especially when you have already chipped that perch with a sword.
Lilo & Stitch: Dr. Jumba partially destroys Lilo and Nani's house while hunting Stitch during a scene that is 100% comedy. The ramifications, however, are the farthest thing from funny: seeing her house burning, the social services agent Bubbles decides Nani is an unfit guardian and takes Lilo away, to be placed in a foster home.
Before that, we also see Nani losing her job as having serious consequences. Bubbles was willing to overlook the antics that went on with his previous visit, but if Nani wants to keep custody of Lilo, she can not be without a source of income.
The Princess and the Frog has the trumpet playing alligator, Louis, when he remembers jumping on a ship trying to join the Jazz band playing on its deck: All humans panicked and open fire.
At the beginning of the movie, Tiana works hard and scrapes together every cent she has until she has enough for the building for her restaurant...only to learn someone else outbid her. And the men who she intended to buy it from are insultingly dismissive of her when they give her the news, because she's black and a woman in a time period when neither were thought suited for moving up in the world.
In Frozen, the king and queen keep Elsa and Anna shut up in the castle, in a misguided (albeit well-meant) effort to protect the girls. Elsa ends up being emotionally withdrawn, while Anna is so desperate for affection that she throws herself headfirst into a relationship with a guy she just met, agreeing to marry him a few hours at the most after they start talking. Everyone points out how unsafe a thing that is for her to do, and sure enough, it turns out that Prince Hans was only manipulating her into marrying him so he could get at the throne.
The latter situation could be seen as a Reality Ensues of the usual "sing-a-song-fall-in-love" plot that Disney often has; turns out, falling in love and deciding to get married the minute you meet someone is a really stupid decision and not as romantic as it sounds.
In the ice palace, Anna tries to win Elsa's support just like a Princess Classic would, by singing an inspiring song about The Power of Friendship and how they can fix everything together. All it achieves is making Elsa even more confused and frightened, resulting in her accidentally wounding Anna. Elsa actually lampshades this.
Elsa: Anna, please, you'll only make it worse!
Kristoph lampshades this trope when he finds out that Anna got engaged to a man she just met, pointing out how spending time with him will only lead to her realizing things like that her fiance has bad habits she hates.
Beauty and the Beast deconstructs the fairy tale's plot point of Beauty falling in love with the Beast after he forces her father to hand her over. Instead, Belle deeply resents the Beast for forcing herself and her father in such a position, and refuses to interact with him. She doesn't warm up to him until he shows genuine kindness to her.
In The Lion King Simba finds out what happens when he ignores his fathers (and in fact also Scar's) warnings and enters enemy territory. He is still a child who cannot match-up with vicious hyenas. He realizes this when he compares his father's footprint with his own: Mufasa is a full grown lion, while Simba is still a cub.