History NiceJobBreakingItHero / LiveActionFilms

* ''Film/TheMcKenzieBreak'': Schluter's attempt to have Neuchel beaten to death during a riot is directly responsible for Connor finding out about the escape plan.

* In ''Film/AManCalledSledge'', VillainProttagonist Sledge's plan relies on him being locked up in the prison for the night. However, the warden plans to hand him over to Sheriff Ripley to be held in the county jail overnight because he hasn't been convicted of anything yet. So Sledge goads Ripley by taunting over the death of his deputy till Ripley not only punches him, but [[KickThemWhileTheyAreDown kicks him several times while he is own the floor]]. The warden is horrified and--fearing Sledge might not survive a night in the jail--agrees to hold him overnight.

* ''The Monitors'': After the heroes drive off the dictatorial machines that enslaved mankind and stopped all human conflict, wars start breaking out all over the place.

** [[Film/BackToTheFuture First film]]: Saves his dad from getting hit by a car--- which as a result keeps his parents from meeting, and in turn, is causing himself and his siblings to slowly be erased from existence.

* In the 2007 film adaption of ''Film/{{Hairspray}}'', when Tracy participates in the march and hits a cop on the head with her sign and runs away, it gives Velma a good opportunity to stop Tracy from participating in the pageant by having the same police guard the entrance,[[spoiler: making Tracy and the others devise a plan to sneak into the pageant. If Tracy had been bailed out along with Maybelle, she wouldn't have had to hide from the cops and sneak into the pageant!]]

* ''Film/TheMcKenzieBreak'': Schluter's attempt to have Neuchel beaten to death during a riot is directly responsible for Connor finding out about the escape plan.

* ''Film/Tremors2Aftershocks'': While trying to escape shriekers, the 1st evolution stage of a graboid, they come across one in the way to an escape truck. So Burt Gummer, resident gun nut, whips out a {{BFG}} and blows it to [[LudicrousGibs bits.]] The problem? He was prepared to shoot at an underground creature, not the small above-ground shrieker. The bullet from the gun goes through the shrieker, a wall, several barrels of oil, and finally, the truck's engine. Burt's response? "How could I have known?!" [[note]]He ''couldn't'' have known. The shrieker was in front of a concrete wall.[[/note]]
* ''Film/TransformersDarkOfTheMoon'': If Optimus Prime hadn't discovered the ''Ark'' on the moon, he wouldn't have been able to use the Matrix to revive Sentinel, allowing the traitor to kill Ironhide, steal back the Space Bridge Pillars, and join Megatron and work on enslaving humanity as a labor force to rebuild Cybertron.
---> Charlotte Mearing: (''After Sentinel ruins the NEST Base.'') ''"Yeah, take a good look, Optimus! This is all on you!"''
* In ''Film/{{Legend 1985}}'', one of the "heroes", Lily, breaks it by [[spoiler: touching a unicorn, even after Jack tells her not to, resulting in the ice death of the world. It gets better. Eventually.]]
* In ''Film/{{Insidious}}'', the twist ending is revealed when [[spoiler:Elise takes Josh's photo, dooming herself and most likely Renai as well. On second thought, Josh is guilty of this as well.]]
* In ''Film/MemphisBelle'', the co-pilot begs for a chance to take some shots at the attacking German fighters, and is elated when he downs one of them ... only to watch in horror as it crashes straight into the tail of the rookie crew's bomber.
* In ''Film/IAmLegend'', Dr. Alice Kripin creates a mutated strain of the Measles virus which cures cancer ... and then promptly mutates again into a much worse virus that wipes out 90% of the human race and causes 99% of the survivors to be mutated into excessively violent vampire/zombie creatures which then slaughter all but a handful of the remaining uninfected people.
* The 2012 ''Film/TheThreeStooges'' film is about the trio trying to raise $830,000 their orphanage is in debt for. It's later revealed that they're in debt because of [[spoiler: insurance bills caused by injuries from their antics over the years]].
* At the end of ''Film/Excision2012'', Pauline tries to [[spoiler:perform a lung transplant for her DelicateAndSickly sister Grace. It goes about as well as you can expect for a complicated procedure performed by someone with no medical training, little proper equipment, and a garage for an operating room]].
* ''Film/RoughNight'': It's swiftly established that the five women could have solved the problem of the dead "stripper" if they'd just reported the death straight away. When they call Blair's uncle for legal advice, he confirms that under the circumstances described to him (Alice impulsively jumped on the stripper and knocked him to the ground so that he suffered a fatal head wound), the death could have been easily ruled as an accident, but when they moved the body to hide it from view until they could call him for advice they compromised the crime scene and created reasonable doubt in their story.
* ''Film/ReapTheWildWind'': [[spoiler:Loxi refuses to help Steve reach Havana in time to relieve Jack of command before he can leave on the ''Southern Cross,'' and even sabotages Steve's efforts. This leads to the death of her cousin, who stowed away on Jack's boat. Loxi herself begins to realize this as evidence mounts that Jack really is in league with Cutler.]]
--> '''Loxi''': Go on, say it. We'd be in Havana if not for what I did.
* ''Film/ResidentEvil2002'': Alice and the assault team manages to shut down the Red Queen, only to realize that the Red Queen was attempting to contain the T-Virus infection within the Hive, and that they have now released hundreds of zombified animals and people into the facility.
* ''Film/TheWolfman2010'':
** [[spoiler:Gwen stops Aberline from shooting Lawrence, which in turn causes him to get bitten. However, this really doesn't do much good since Gwen ends up shooting Lawrence herself in the end. Although, she's somewhat justified since she was still convinced she could reach Lawrence, and well... [[IKnowYouAreInThereSomewhereFight she was right]]. Plus, she probably figured that Lawrence would have finished off Aberline instead of chasing after her instead.]]
** [[spoiler: Whilst in the Hindu Kush, the locals who told Sir John about the feral child in the cave, thus causing him to get infected.]]
* ''Film/{{Transcendence}}'':
** It's made clear during the climax that [[spoiler: the AI was Will all along and all he wanted to do was fulfill his wife's dream of using technology to heal the planet. Had the Government not interfered, as well as Evelyn not give into her doubts, Will would have created paradise on earth. "Humans fear what they don't understand." Instead much of humanity is sent back to the Stone Age and countless millions likely died in process.]]
** Max actually sides with the people that murdered Will to stop the machine impersonating him. [[spoiler: They only succeed because RIFT threaten to kill Max unless Will destroys himself, a plan that only works because it's genuinely Will. Essentially Max enables RIFT to kill both his best friends and end a chance at a better world.]]
* In ''Film/{{Pixels}}'', one of the Arcaders uses cheat codes to win against Pac-Man, but all it succeeds in is enraging the aliens and speeding up the destruction of Earth.

* In ''Film/TheLastWitchHunter'', while certainly effective, Axe and Cross seems to have problems with this.
** They never once mention to Kaulder that [[spoiler:the Witch Queen's heart is still alive, which could have kept him aware of possibility that it may be used to bring her back one day]], which is ''exactly what happens''.
** While the above is bad enough, the fact that they [[spoiler:withhold the little fact of the heart being stolen]], thus stunting Kaulder's investigation until it's too late, smacks of idiocy.
** At some point, they switched from killing dangerous witches on spot to arresting them. While humanitarian and commendable, this creates world's most powerful coven for the Witch Queen to use for her spell.
* The movie ''Film/ToySoldiers'' has a scene where [[spoiler: [[Creator/WilWheaton Joey]], one of the students, killed]] when he tries to inspire a revolution against the Colombians holding the students hostage. This causes the villain's plot to implode, thereby placing the student body in danger because [[spoiler: Joey's father, TheDon, orders the murder of [[BigBad Cali's]] father during a prison riot. Since Cali is holding the students hostage in exchange for his father, he orders the murder of the students as soon as he finds out.]]
* ''Film/RockyII'': Rocky as the movie progress faces serious financial issues and has to accept the rematch with Apollo despite the concern he could potentially go blind if he suffers serious damage. All of this could have easily been avoided had Rocky not been so irresponsible with his money and blew it all away on things like motorcycles and jackets. Adrian at one point even tried to talk Rocky out of buying expensive jewelry for her so they could save money, but he would not listen nor did he bother to listen to Gonzo's advice about investing the money he made.
* ''Film/TheCloverfieldParadox'' reveals that [[spoiler:the the first successful firing of the Shepard supercollider to in an attempt to solve the ''Cloverfield Station'' crew's world's energy crisis not only wrecked their own world, but by implication of the titular theory, TheMultiverse, including the worlds of the original ''Film/{{Cloverfield}}'' and ''Film/TenCloverfieldLane''.]]
* In the 1963 SwordAndSandal film ''Film/JasonAndTheArgonauts'', Hercules awakens the colossal LivingStatue Talos on the [[IsleOfGiantHorrors Isle of Bronze]] when he steals a javelin-sized brooch-pin from the divine treasure trove he is guarding. Talos chases Hercules and Hylas back to the ship, where Talos destroys it. Jason is able to defeat Talos by [[AttackItsWeakpoint removing a plug from his ankle]], causing the lava-like "blood" to leak out. [[spoiler:Hylas is crushed under Talos when he goes back to retrieve the brooch-pin and he falls down on top of him, and [[ItsAllMyFault Hercules blames himself for the death of his friend]].]]
* In ''Film/IpMan4'', as well-intended as he was, Hartman's attempts to bring Chinese kung-fu to the military by going over his superior Geddes is what spurs Geddes to send Frater to cause trouble in Chinatown, only for Geddes himself to later attack the Chinese Benevolence Association when it wasn't enough.

* In ''Film/EighthGrade'':

* In the film ''Film/IDrinkYourBlood'', after his sister is raped by hippies, a young boy laces several pies with the rabies virus, and as a result, those who eat said pies end up becoming zombies.
* ''Film/JurassicPark'':
** After Nedry shuts down the fences to steal the embryos and make his escape, the ''Tyrannosaurus rex'' gets out and wreaks havoc. In order to undo what Nedry has done, Hammond wants the computers shut down and restarted. When [[Creator/SamuelLJackson Ray Arnold]] initially refuses, Hammond insists: "People are dying. Would you ''please'' shut down the system." Arnold does so. Nedry was smart enough to program the raptor fences to stay operational during his sabotage; the total system shutdown releases the Velociraptors. Prior to this, the ''T. Rex'' had only killed one person and likely preferred snacking on its fellow dinosaurs as opposed to stringy, bony humans; the raptors kill two humans [[ForTheEvulz for the simple sport of it]], and relentlessly pursue the main characters for the rest of the film.
** When Ellie Sattler turns the power back on it also turns on the electric fence that Dr. Grant and the kids are climbing down. Dr Grant and Lex successfully gets down but Tim gets [[HarmlessElectrocution electrocuted]] and flies to the ground. Luckily he [[PlotArmor survives.]]
** When the ''T. rex'' breaks out and attacks the kids, Dr. Grant gets its attention with a flare and then throws it away, causing the ''T. rex'' to forget about the kids and chase after the flare. So far, so good, except Ian Malcolm tries to help with his own flare, which only causes the ''T. rex'''s attention to be turned back to the people instead of Grant's flare. Malcolm's own attempt to throw the flare away doesn't work because he's running while doing so, so the ''T. rex'' focuses on the larger moving target. The result is that it keeps chasing him, leading to Malcolm being injured and Gennaro killed.
** Also the [[DesignatedHero heroes]] of [[Film/TheLostWorldJurassicPark the sequel]], who are responsible for many of the deaths in the movie.
** And yet again in ''Film/JurassicWorld'', in which all the carnage is the result of a series of unfortunate events beginning with the supposed hero accidentally letting the ''Indominus rex'' out of its enclosure because he wasn't willing to wait five minutes for his boss to check its tracker.
** The sequel ''Film/JurassicWorldFallenKingdom'' has a lot of VillainBall to allow its plot to happen, but the heroes aren't above it with Claire trusting [=InGen=] in the first place, and with her and Owen not breaking off from the delivery group as soon as they can and calling the police to arrest the villains at Lockwood's mansion while the dinosaurs stay in their cages, opting instead for a more chaotic and violent confrontation during the black market auction that ends up releasing the dinosaurs into the wild. To say nothing about Benjamin Lockwood learning about the villains' plan, and instead of calling the police himself and avoiding the whole disaster, he has a TooDumbToLive power trip craving that makes him ask [[CorruptCorporateExecutive Eli Mills]] to call the cops and turn himself in, and the sleazy bad guy simply kills the defenseless old man with no witnesses around in response.
* Franchise/MonsterVerse:
** ''Film/Godzilla2014'':
*** [[Characters/MonsterVerseUSGovernmentAndMilitary Admiral Stenz]] approves a plan to attempt killing both Godzilla and the [=MUTOs=] by luring them out to sea with a nuclear warhead and detonating it, but it instead causes things to go FromBadToWorse. The train carrying the nuclear warheads is ambushed by a MUTO which promptly eats two of the nukes, and later still, the [=MUTOs=] [[spoiler:steal the remaining warhead in a highly-populated city before it can be used to lure them out to sea]]. The only two things the nuclear plan accomplishes are providing the [=MUTOs=] with a radiation source to [[spoiler:incubate their nest]] and putting hundreds of thousands of civilians within the stolen nuke's blast radius with the timer counting down.
*** The Navy accidentally provoke Godzilla into destroying the Golden Gate Bridge.
** ''Film/KongSkullIsland'': [[Characters/MonsterVerseSkullIslandExpedition Randa]]'s duplicity is what results in the conflict between Kong and Packard in the first place. Not only does he lie to Packard about the true purpose behind the expedition to Skull Island but his decision to bomb the island in order to draw out a monster is what causes Kong to kill Packard's men. It also leads to the Skullcrawlers waking up.
** ''Film/GodzillaKingOfTheMonsters2019'':
*** The heroes lead Rodan to King Ghidorah in hopes that they'll kill each other. [[spoiler:After Ghidorah beats him up badly, Rodan ends up becoming TheDragon to Ghidorah as a result, which allows Ghidorah to summon him to counter Mothra's interference]]. Had they not done so, it's likely Mothra and Godzilla may have defeated Ghidorah in much quicker time during the FinalBattle.
*** Admiral Stenz and the military, just like the last time that the former got involved. As Ghidorah is curb-stomping Rodan off the coast of Mexico, the military deploys [[spoiler:an Oxygen Destroyer]] in hopes that it'll kill both of them. The warhead hits when [[HumansNeedAliens Godzilla]] is in the middle of subduing Ghidorah, and not only does Ghidorah completely NoSell it (presumably because of his alien nature), but it severely weakens and almost kills Godzilla, the only one capable of challenging Ghidorah. Even more so given Godzilla had the HomefieldAdvantage on Ghidorah underwater and potentially could have won then and there.]] With the sole threat to Ghidorah's reign removed, even temporarily, Ghidorah awakens the dormant Titans around the world (the very thing everyone was trying their hardest to avoid) and commands them to begin actively razing human cities and threaten to create an extinction event. Additionally, it's indicated the Oxygen Destroyer's fallout is responsible for crippling the island fishermen's livelihoods, which in turn leads them to [[spoiler:selling Ghidorah's dredged-up severed head to Alan Jonah]].
** ''Film/GodzillaVsKong'':
*** Mark Russell is quick to assume there's no reason for Godzilla's attack and discount Madison's objections to that. [[spoiler:Thus instead of investigating that, Monarch is busy trying to stop Godzilla, allowing Mechagodzilla to be completed under their noses and Ghidorah to resurrect through it. He [[OhCrap seems to realize this]] when Mechagodzilla emerges and starts leveling Hong Kong.]] In the novelization [[spoiler:he begins to realize it earlier when Monarch detects the Ghidorah signal in Hong Kong and he pieces together Madison may have been right, and instantly suggests Monarch start investigating Apex.]]
*** [[Characters/MonsterVerseKingKong Kong]] activating the energy source in the Hollow Earth with his axe allows Apex to get their hands on it to [[spoiler:power up Mechagodzilla, allowing Ghidorah to come all the way back to life.]]
*** Slightly {{Downplayed}} by [[Characters/MonsterVerseGodzilla Godzilla]] and Kong. To be fair on Kong, he had no interest in picking a fight with Godzilla, and it was Godzilla who struck first when humans removed Kong from Skull Island. When Godzilla tracks [[spoiler:Ghidorah's signal]] to Hong Kong, him sensing the Hollow Earth's core energy being harvested by Apex prompts him to immediately blast open a passage straight to the Hollow Earth -- the destruction of Kong's [[spoiler:ancestral home]] in the Hollow Earth enrages him into actively battling Godzilla, which not only gives Apex Cybernetics adequate time to activate [[spoiler:Mechagodzilla with the Hollow Earth energy (which also causes Ghidorah's remnant consciousness to reawaken and hijack Mechagodzilla's [[ElectronicTelepathy psionic link]])]], but it also leaves [[spoiler:Kong unable to fight and Godzilla physically exhausted when the Ghidorah-controlled Mechagodzilla emerges. As it stands, had Godzilla focused entirely on finding Mechagodzilla instead of going out of his way to attack Kong even when the latter had no interest in fighting him, he could've likely destroyed Mechagodzilla before it could go online.]]
** See [[NiceJobBreakingItHero/ComicBooks Comic Books]] for more.
* At the end of the second ''Reiko the Zombie Shop'' movie adaptation, the title heroine confronts the bad guy who intends to resurrect the witch who was killed by Reiko in the first movie. The bad guy is at Reiko's mercy and she's armed with a dagger, so what do you think she does? Stab him? Wrong! She uses her trademark power to turn his victims (including a cop) into zombies who attacks the bad guy AND Reiko, then she grabs the zombie cop's gun and shot the bad guy to death, only to discover that by turning the victims into zombies, she also resurrected the witch who escaped while she was fighting. But wait, there's more: the last scene reveals that after Reiko left, the witch resurrected the bad guy and they are now working together. And guess what's worse? This cliffhanger is never resolved! The third and last movie adaptation deals about a different story, so we are left to assume that the two evildoers are still at large, thanks to Reiko being too dumb to use a dagger!
* At the end of ''Film/TheRing'', we find out that not only has the creepy girl from the well not been defeated, she's actually been released to reign terror upon the rest of the world. Plus she never sleeps, so it's not like we'll be getting a daily eight hour break from the reign of terror.

* In ''Film/TheCabinInTheWoods'', when the heroes successfully stop the Evil Plan, they find the results [[spoiler:{{Eldritch Abomination}}s destroy the world without their once-a-year sacrifices]] fall under this trope.
* In ''Film/BigGame'', [[spoiler:Herbert is brought to National Security Vault to advise on saving the president.]] The person who had this brilliant idea has just unwittingly put TheMole in place where he can do the most damage.
* ''Film/TheFightingSeabees'': Donovan and his men's first attempt to arm themselves and assist in the defense of a war zone inadvertently ruins a trap that would have let Yarrow wipe out the Japanese soldiers without losing any men.

* In ''Film/{{Speed}}'', while under the bus in a failed attempt to disarm the bomb, Jack has to punch a hole in the bus's gas tank with his screwdriver as a makeshift grip to keep himself off the ground to avoid being run over when his cart breaks. By causing the leak, Jack has now significantly cut down the time he and the LAPD have in trying to find a solution to end the crisis. When he informs driver Annie about it once safely in the bus, she replies in a panic, "What, did you feel like you needed another challenge?!"
** Also, when the injured driver is being evacuated, the police on the flatbed try to get an old woman on the bus to come too, despite warnings from the bomber that he won't allow it. She [[spoiler:tries to leave, but a bomb is triggered beneath her feet, dropping her under the wheels of the bus.]]
* During the climax of ''Film/{{Dogma}}'', the fallen angel Bartleby needs to become human so he can take advantage of [[http://en.wikipedia.org/wiki/indulgence plenary indulgence]] in order to return to Heaven. Thus proving God wrong and thereby unmaking all of creation. To do so, he needs to remove his wings... which is promptly done for him with a machine gun by a particularly clueless hero who was trying to kill him.
* Every protagonist from the ''Franchise/{{Saw}}'' films (with the exception of ''Film/SawI'' and ''Film/SawVI'') suffers from this, the worst case being Matt Gibson from ''Film/Saw3D''.
* In ''Film/{{Immortals}}'', Theseus acquires the [[ChekhovsGun Epirus Bow]], but shortly after getting it, [[spoiler: he drops it. The weapon is then taken by a dog (don't ask) and delivered to the BigBad, who then uses it to ''great'' advantage. Had it not been for the gods' BigDamnHeroes moment at the end, his evil plans would've succeeded entirely.]]
* In ''Film/TheMatrixReloaded'', Neo encounters the Architect on his journey to destroy The Matrix. He learns that, if he proceeds, every man, woman, and child connected to the Matrix would die, which, combined with the destruction of the rebellion, would be TheEndOfTheWorldAsWeKnowIt. Neo does it anyway. It got better, though.

* ''Film/HarryPotter'':
** The film version of ''Film/HarryPotterAndTheOrderOfThePhoenix'' has a tragic example of this. Harry runs to his godfather's rescue [[spoiler:only to be the cause of Sirius's demise]]. "Nice one, James.".
** Also, in ''Film/HarryPotterAndThePhilosophersStone'' since Dumbledore had enchanted [[spoiler: The Mirror of Erised to only give the stone to someone who didn't want to use it]] Voldemort couldn't have retrieved it until Harry showed up and [[spoiler: the stone appeared in his pocket]]. Furthermore, since Voldemort couldn't get the stone anyway, Harry and his friends' quest to stop Voldemort was unnecessary and they put their lives in danger for nothing. Actually, all they did was kill Quirrel.
*** Not just that, they set off an order of events that would eventually lead to Harry's own death (and every other death in the series). Voldemort was stuck in Quirrel, living a half life, he wasn't exactly thriving. By beating him in that form at that time he didn't allow Dumbledore time to find his horcruxes (which would have prevented him from respawning) and opened the door for him to come back as a complete (more or less) being '''and''' lose his inability to touch Harry. And it's not like Voldemort could've got the stone since even if he got wise and tried to use someone else to get it with the Imperius curse, they still wouldn't be able to get it because the second he tells them to get it they will want to get it and will therefore not be able to get it. He was stuck in that form and Harry did him a huge solid.
** In ''Film/FantasticBeastsTheCrimesOfGrindelwald'', Tina lies to her sister Queenie about going to Paris on official assignment as an Auror even though she’s their off the books. When Queenie goes to the Ministry to find her after she and her fiancé Jacob had a fight, she can’t find her and quickly gets overwhelmed with thoughts she can’t understand with her mind reading powers. This breakdown causes Grindelwald’s followers to quickly prey on her by helping her as a means to manipulate her to their cause.
* In ''Film/{{Frequency}}'', John manages to use the [[AppliedPhlebotinum time-travel radio]] to keep his father, Frank, from dying in the burning building that had claimed his life thirty years ago. And so doing began a chain of events that caused a SerialKiller to live instead of die who then goes on to murder many more women including John's mother. Oh, and did I mention Frank still dies from lung cancer because he smokes?
** The rest of the movie is spent trying to stop the serial killer from killing his other victims, including Frank's wife. [[spoiler:In the end, the killer, who is still at large in the present, breaks into John's house and attacks him while John's talking to his father on the radio. Right as it looks like he's going to win, in walks a thirty-year-older Frank with a shotgun. He'd heard the fight on the radio, and thus knew exactly where the killer was going to be thirty years from now]].
* ''Film/TheGreatSilence'':
** Just when Silence goads Loco into pulling a gun on him, the sheriff shoots away the gun Loco is reaching for to defuse the fight and arrests Loco. If he had let the fight go forward [[spoiler:Silence might have won and kept Loco from killing Silence, the sheriff, and their allies]]. Later, [[spoiler:the sheriff disarming an outlaw trying to shoot the captured Loco also helps lead to this tragedy]].
** The sheriff telling the outlaws (who only steal to survive) to go to Snow Hill for good after he arrests Loco [[spoiler:makes them easier prey for Loco once he escapes]].* The whole plot of ''Film/TheButterflyEffect'' is a series of these.
* ''Film/TheDarkKnightTrilogy'' by Creator/ChristopherNolan could almost codify this trope.
** In ''Film/BatmanBegins'', Bruce Wayne's desire for justice for Gotham leads him on a personal quest where he's declared dead, leaving Wayne Industries in the business of (among other things) weapons development. One device of Wayne Tech is stolen and used against the city. If Bruce had managed his company, that device might have never been made.
** ''Film/TheDarkKnight'': Franchise/{{Batman}}'s destruction of the Falcone family's dominance of Gotham City leads to not only a myriad of gangs trying to fill the gap, [[spoiler:but also the rise of ComicBook/TheJoker, who creates far more chaos and destruction.]] There are obvious real life parallels to international politics to when a power vacuum is created (collapse of the Soviet Union leading to rise of nationalism and fundamentalism) and law enforcement (the weakening of the Mafia that clears the way for Chinese, Russian, or Columbian gangs, for instance).
*** After Reese has run some numbers, Lucius Fox makes him do it all over again to teach him a lesson. This second, closer look leads to Reese discovering the identity of the Batman.
** ''Film/TheDarkKnightRises'': [[spoiler: Bruce Wayne dilly-dallies with nuclear fusion technology as an energy source, not realizing he was manipulated to do this to create a fusion bomb by remnants of the League of Shadows.]]
** Bruce choosing Miranda to be in charge of the fusion reactor project, unaware that [[spoiler:she is actually Talia Al Ghul]], which grants her [[spoiler: the possibility of flooding the basement to completely give the heroes no chance of ever stopping the bomb in the first place.]]
** The whole plot of ''Film/TheDarkKnightRises'' is because Bruce "let Ducard/Ra's die" in ''Film/BatmanBegins''. [[spoiler:Talia, who used to have a rather strained relationship with her father prior to that, then seeks to accomplish her father's visions]].
* Happens in ''Film/Batman1989'' as well with the Joker's backstory, though to be fair it really was an accident and Batsy [[ThouShallNotKill wasn't intentionally trying to send Jack Napier over the railing]], and in fact [[SaveTheVillain actually tried to save him]] from falling into the vat of chemicals that would lead to him becoming the Joker. During their final confrontation, Joker points out that [[CreateYourOwnVillain "you made me".]]
* In ''Film/TheBatman2022'', a running theme is that Batman's [[SecretIdentityIdentity lack of work-life balance]] is [[ExhaustedEyeBags tearing him apart]] and [[NotQuiteTheRightThing creating more problems than it solves]]. [[spoiler:Bruce's single-minded obsession with being Batman blinded him to the fact that the Wayne Renewal fund was supporting criminal activity in Gotham, and his actions as a TerrorHero [[SuperheroParadox have instead inspired copycats who seek to emulate his "example"]] with much more lethal and destructive methods and none of his standards. In the end, he resolves to change his ways and become a HopeBringer to Gotham instead of solely a symbol of fear while using his company to do more for the city]].

* Creator/JohnWoo's ''[[Film/BrokenArrow1996 Broken Arrow]]'' sees the hero finding a nuclear warhead which the villain has left in a mine. It hasn't been armed yet, so he comes up with the idea to enter the wrong arming code three times, causing a security measure to lock the warhead so it can't be armed. He does so...only for the villain to mockingly inform him that he used uncoded circuit boards, "You have just armed a nuclear warhead, my friend." Oops.

* Near the end of ''The Haunting in Connecticut'', the reverend manages to exorcise the ghost from the house. [[spoiler: Too bad he's a benevolent spirit who was preventing the dozens of malicious ghosts from wreaking havoc.]]
* In ''The Monitors'', after the heroes drive off the dictatorial machines that enslaved mankind and stopped all human conflict, wars start breaking out all over the place.
* ''Film/JamesBond'':
** In ''Film/DiamondsAreForever'':
--->'''Tiffany''': I did it, I switched the tape in the machine.
--->'''Bond''': You stupid twit, you put the ''real'' one back in!
** In ''Film/LicenceToKill'', Bond's RoaringRampageOfRevenge ends up screwing up the actual plans other law enforcement agencies had in place, and gets a lot of them killed.
** In ''Film/{{Skyfall}}'', M gave Silva to the Chinese to save 6 agents, but in the process caused Silva's StartOfDarkness, leading him to kill dozens of [=MI6=] staff later on. Also, Q's attempt to decrypt Silva's computer by plugging it into [=MI6's=] network ends up [[spoiler: releasing a virus that opens every door in [=MI6=]'s new base, allowing Silva to escape.]]
** In ''Film/{{Spectre}}'', Bond's conversation with Mr. White implies that SPECTRE is a reformed QUANTUM, the [[NebulousEvilOrganization crime organization]] from the first two Creator/DanielCraig films, after Bond destroyed much of its leadership in ''Film/QuantumOfSolace''.
* In ''Film/FridayThe13thPartVIJasonLives'', Tommy Jarvis, [[NoKillLikeOverkill just to be absolutely sure]], digs up Jason Voorhees' corpse, and impales it with a steel rod. Cue [[LightningCanDoAnything freak lightning bolt]], which resurrects him as an unstoppable zombie.
* ''Film/TheMcKenzieBreak'': Schluter's attempt to have Neuchel beaten to death during a riot is directly responsible for Connor finding out about the escape plan.
* The FridgeLogic in ''Film/TenThousandBC'' sets in that, you know, D'leh and his buddies destroyed one of the only BASTIONS OF CIVILIZATION and set humanity back god knows how long. [[ValuesDissonance A few sacrifices isn't that much of a price to pay]].
* At the end of ''Annihilation: Earth'', David is torn between his idea of shutting down the particle colliders to stop the apocalypse or making them even stronger, as his Middle Eastern colleague Raja suggests, which will (supposedly) force the anomaly to be "snuffed out." His boss makes him doubt Raja's motives, and David ends up going with his original plan. Cue the literal EarthShatteringKaboom. The moral of the story: not all Arabs are terrorists.
* ''Film/TheHungerGamesMockingjayPart1'' has Katniss tearfully telling the cameras that the Capitol was responsible for the destruction of a hospital full of innocents. While the Capitol planes were showing aggression, it was actually Katniss and Gale who shot down the planes, causing them to smash into the hospital and completely destroy it.
* In ''Film/{{Dragonheart}}'', the knight Bowen is reluctant to kill Draco, even though it's the only way to save the kingdom from its AxCrazy king Einon, because Draco is the last dragon left in the world. Whose fault is that, might you ask? Why, Bowen's, who spent ten years on a personal crusade to wipe out the species!
** Eh, that was part of it, the other part being that Draco had become his best friend. See how eager you are to kill YOUR best friend when the chips are down. No, the real hero who did the breaking is Draco himself, by giving half his heart to a monomaniacal JerkAss he created an immortal dictator that made life a misery for his subjects.
** The Chinese in the sequel. First, they slaughter all their dragons because one of them turned out to be bad (whom the others immediately stopped and punished). Then they take the heart of the bad dragon to England, which results in the BigBad (the same dragon) restoring his original form.
* This trope kicks off ''{{Dracula}} Has Risen From His Grave'', in which a couple of priests go to Dracula's castle to exorcise any lingering evil left over from the previous Creator/ChristopherLee Dracula flick. One of the pair slips and falls on some rocks, and blood from his resulting scalp wound drips down to where Dracula's inert body is lying, reviving the vampire for another round of mayhem.
* ''Film/HeroicTrio'' sees an evil sorcerer kidnapping babies to raise as an evil army. One of the main characters kidnaps a baby in order to lure the real kidnapper out. This results in a fight between a fellow hero who [[LetsYouAndHimFight mistakes her for a villain]] and to make matters [[FromBadToWorse worse]], the real kidnapper shows up to fight both of them. The baby ends up dying in the process.
* ''Film/Tremors2Aftershocks'': While trying to escape shriekers, the 1st evolution stage of a graboid, they come across one in the way to an escape truck. So Burt Gummer, resident gun nut, whips out a {{BFG}} and blows it to [[LudicrousGibs bits.]] The problem? He was prepared to shoot at an underground creature, not the small above-ground shrieker. The bullet from the gun goes through the shrieker, a wall, several barrels of oil, and finally, the truck's engine. Burt's response? "How could I have known?!" [[note]]He ''couldn't'' have known. The shrieker was in front of a concrete wall.[[/note]]
* In ''Film/TheMummyTombOfTheDragonEmperor'', Lin, who had been the guardian of the tomb and tried to prevent the emperor from escaping, was responsible for knocking the diamond into the emperor that awakes him as she attempts to attack his decoy.
* In ''Film/TwentyEightDaysLater'', an AnimalWrongsGroup releases the Rage Virus when trying to free some filthy monkeys. This is ''after'' they are directly told by ''a scientist'' that the monkey "is infected with 'rage' and all it takes is one bite".
* In ''Film/TwentyEightWeeksLater'', the SwissCheeseSecurity of the compound allows people to leave the safe zone at will, leading to the discovery of a virus carrier that they bring into the safe zone and leave in an unlocked room with no guards to speak of. When someone inevitably gets infected, their decision is to herd the population into a poorly guarded room and shut all the lights off. Naturally, it gets worse when it leads to nearly everyone dead or infected. Then at the end, [[spoiler: the boy becomes a carrier and his sister [[TooDumbToLive neglects to ''tell'' anyone]], which results in the infection decimating France and possibly all of mainland Europe.]]
* In ''Film/{{Blade}}'', the hero doesn't kill Quinn completely, allowing him to revive himself in a hospital to turn Karen and kill her boyfriend. Since Blade shows up immediately after this happens, looking for Quinn, he apparently knew that Quinn wasn't dead. His reasons for leaving Quinn alive in the first place are never explained, leaving a plot hole.
* ''Film/TransformersDarkOfTheMoon'': If Optimus Prime hadn't discovered the ''Ark'' on the moon, he wouldn't have been able to use the Matrix to revive Sentinel, allowing the traitor to kill Ironhide, steal back the Space Bridge Pillars, and join Megatron and work on enslaving humanity as a labor force to rebuild Cybertron.
---> Charlotte Mearing: (''After Sentinel ruins the NEST Base.'') ''"Yeah, take a good look, Optimus! This is all on you!"''
* In ''Film/{{Legend 1985}}'', one of the "heroes", Lily, breaks it by [[spoiler: touching a unicorn, even after Jack tells her not to, resulting in the ice death of the world. It gets better. Eventually.]]
* In ''Film/{{Insidious}}'', the twist ending is revealed when [[spoiler:Elise takes Josh's photo, dooming herself and most likely Renai as well. On second thought, Josh is guilty of this as well.]]
* In ''Film/MemphisBelle'', the co-pilot begs for a chance to take some shots at the attacking German fighters, and is elated when he downs one of them ... only to watch in horror as it crashes straight into the tail of the rookie crew's bomber.
* In ''Film/{{Men In Black II}}'', J neuralyses Newton at the video store, and gives him an instruction to not live with his mother, as he was a middle-aged man. It is heavily implied (by him calling for his mother while brandishing a shovel) that he kills her to follow this instruction from J.
* In ''Film/IAmLegend'', Dr. Alice Kripin creates a mutated strain of the Measles virus which cures cancer ... and then promptly mutates again into a much worse virus that wipes out 90% of the human race and causes 99% of the survivors to be mutated into excessively violent vampire/zombie creatures which then slaughter all but a handful of the remaining uninfected people.
* The 2012 ''Film/TheThreeStooges'' film is about the trio trying to raise $830,000 their orphanage is in debt for. It's later revealed that they're in debt because of [[spoiler: insurance bills caused by injuries from their antics over the years]].
* In ''Recap/MysteryScienceTheater3000TheMovie'', Mike is goaded by Crow and Tom to pilot the Satellite of Love, despite being warned by Gypsy not to do so. Mike brushes her off, starts it off smoothly... then promptly runs into the Hubble Telescope. Then he tries to pull it off with the manipulator arms, tearing a part of it off wiping sweat off his forehead. When he finally releases, it suddenly drops to Earth as a fireball! Mike {{lampshade|Hanging}}s the improbability of the last one.
* ''Film/{{Flash Gordon|1980}}''
** Ming claims to only destroy planets that are advanced enough to realize his attacks aren't natural disasters...hence, it's Zarkov's own attempt to contact whoever was launching the attacks that nearly dooms the Earth.
** Zarkov also gets Flash killed. Good going. Flash [[OnlyMostlyDead gets better]] though.
* The fact-based drama ''Film/{{Amen}}'' about Kurt Gerstein, a member of the [[ThoseWackyNazis SS]] who develops and mass produces Zyklon B for use in Poland. [[MyGodWhatHaveIDone Then he finds out]] [[HeelRealization exactly what the SS meant by]] ''[[DeadlyEuphemism pest control]]''.
* Marty [=McFly=] of ''Franchise/BackToTheFuture'' can't go one movie without doing this trope:
** [[Film/BackToTheFuture First film]]: Saves his dad from getting hit by a car--- which as a result keeps his parents from meeting, and in turn, is causing himself and his siblings to slowly be erased from existence.
** [[Film/BackToTheFuturePartII Second film]]: Purchases [[TimelineAlteringMacGuffin a sports almanac]]--- which {{Bi|gBad}}ff steals and delivers to his past self in 1955, allowing a new power hungry Biff to turn the post-1955 era into a BadFuture. And in another case of breaking things, Biff managed to use the Delorean to go back to the past just because Marty happened to be looking away from it for a few minutes. Also an example for Doc Brown, who forced Marty to throw away the Almanac allowing Biff to find it.
** [[Film/BackToTheFuturePartIII Third film]]: Saves Doc Brown from getting killed by "Mad Dog" Tannen--- and now changes history so that he'll be the one getting killed instead.
* At the end of ''Film/Excision2012'', Pauline tries to [[spoiler:perform a lung transplant for her DelicateAndSickly sister Grace. It goes about as well as you can expect for a complicated procedure performed by someone with no medical training, little proper equipment, and a garage for an operating room]].
* In ''Film/RoughNight'', it's swiftly established that the five women could have solved the problem of the dead "stripper" if they'd just reported the death straight away. When they call Blair's uncle for legal advice, he confirms that under the circumstances described to him (Alice impulsively jumped on the stripper and knocked him to the ground so that he suffered a fatal head wound), the death could have been easily ruled as an accident, but when they moved the body to hide it from view until they could call him for advice they compromised the crime scene and created reasonable doubt in their story.
* See NiceJobBreakingItHero/MarvelCinematicUniverse
* In ''Film/StarTrekIntoDarkness'', Kirk stuns a creature that appears before him as he runs from a planet's natives, only for Bones to tell him that the creature was their ride out.

* ''Franchise/DCExtendedUniverse'':
** ''Film/ManOfSteel'':
*** When Clark tells Zod [[spoiler: how he managed to control his super-senses, Zod is able to make use of the information to become ''that much more dangerous''.]]
*** When Clark begins exploring the [[spoiler: Kryptonian spacecraft he finds in the Artic, he inadvertently sets off a beacon that alerts Zod and his followers to the presence of Earth.]]
*** ''Every decision'' made by any Kryptonian who is not Zod in the opening sequence is an example of this: Jor-El stealing the codex, which did nothing but give Zod a reason to go looking for it. [[IllNeverTellYouWhatImTellingYou Jor-El telling Zod that Kal-El and the codex are on the rocket he just fired off]]. The council [[CruelMercy imprisoning Zod and his allies in the Phantom Zone]] when they know their planet is doomed, anyway.
** ''Film/BatmanVSupermanDawnOfJustice'': Superman [[spoiler:overpowers Doomsday and drags him into space, where they can fight without hurting anyone]]. The President decides to launch a nuke at them, ignoring General Swanwick's protests that Superman has the situation well in hand. The end result, [[spoiler:Superman gets knocked out and nearly killed, while the explosion knocks Doomsday back to Earth and makes him more powerful.]]
* In ''Film/PacificRim'', [[spoiler: Newton drifts with a partial {{kaiju}} brain, and learns that the kaiju operate on a hive mind and are being engineered. Unfortunately, he forgot that the drift works both ways, meaning the kaiju hivemind now know what he knows.]]
** Also Stacker Pentecost grounding Gypsy Danger is what probably cost the lives of the two jaeger crews that died in the first double kaiju attack. If he had let the go out right away it's likely that all four of the last jaegers would have survived.
* In ''[[Film/PercyJacksonAndTheOlympians The Lightning Thief]]'', Percy slices off the Hydra's heads, not knowing that it would come back with ten instead of five.
* ''Film/TheDistinguishedGentleman'': The protagonist is a ConMan who's just scammed his way into Congress. The first time he votes, he doesn't even bother to find out what it's for, since he's having too much fun just being there. On a whim, he pushes "No". Then he encounters a public tour whose guide asks him about his vote and confronts him with the knowledge that it was a welfare bill. Oops.
* ''Film/ReapTheWildWind'': [[spoiler:Loxi refuses to help Steve reach Havana in time to relieve Jack of command before he can leave on the ''Southern Cross,'' and even sabotages Steve's efforts. This leads to the death of her cousin, who stowed away on Jack's boat. Loxi herself begins to realize this as evidence mounts that Jack really is in league with Cutler.]]
--> '''Loxi''': Go on, say it. We'd be in Havana if not for what I did.
* ''Film/ResidentEvil2002'': Alice and the assault team manages to shut down the Red Queen, only to realize that the Red Queen was attempting to contain the T-Virus infection within the Hive, and that they have now released hundreds of zombified animals and people into the facility.
* ''Film/TheWolfman2010'':
** [[spoiler:Gwen stops Aberline from shooting Lawrence, which in turn causes him to get bitten. However, this really doesn't do much good since Gwen ends up shooting Lawrence herself in the end. Although, she's somewhat justified since she was still convinced she could reach Lawrence, and well... [[IKnowYouAreInThereSomewhereFight she was right]]. Plus, she probably figured that Lawrence would have finished off Aberline instead of chasing after her instead.]]
** [[spoiler: Whilst in the Hindu Kush, the locals who told Sir John about the feral child in the cave, thus causing him to get infected.]]

* In ''Film/StreetFighter'', we have Carlos Blanka who's been captured by [[BigBad M. Bison]] and what does Colonel Guile do? Tell good old Charlie to "hang on buddy" ''right in front of Bison!'' Way to tell the deranged lunatic who has a personal investment in you that he has your friend ''right there'' and at his mercy. [[MindRape Guess]] [[PlayingWithSyringes what]] [[BrainwashedAndCrazy Charlie's]] [[BioAugmentation fate]] [[WasOnceAMan is]].
* In ''Film/StVincent2014'', aside from hanging out with a prostitute, Vincent took Oliver to a racetrack and a bar while babysitting him. This ends up costing Oliver’s mother half-custody when Oliver’s father takes her to court.

* In ''Film/FollowTheFleet,'' Bake goes to a theatrical producer to try to get Sherry an audition for a show. He hears that the producer is already auditioning someone he really likes for the part, so Bake sabotages the unknown performer. What he doesn't realize is that Sherry has gotten an audition on her own, so she's the one he's sabotaging.

* In ''Film/{{Ghostbusters 1984}}'', at the climax, Gozer demands that the Ghostbusters pick the form of The Destroyer, Gozer's instrument to kill all life on Earth. Peter, Egon, and Winston all manage to keep from thinking of anything, but poor Ray had an idea - the most innocent thing he could think of from his childhood - the Stay-Puft Marshmallow Man. Cue 100-foot tall marshmallow golem rampaging through New York.
* Film/RockyII: Rocky as the movie progress faces serious financial issues and has to accept the rematch with Apollo despite the concern he could potentially go blind if he suffers serious damage. All of this could have easily been avoided had Rocky not been so irresponsible with his money and blew it all away on things like motorcycles and jackets. Adrian at one point even tried to talk Rocky out of buying expensive jewelry for her so they could save money, but he would not listen nor did he bother to listen to Gonzo's advice about investing the money he made.
* ''Film/DeepCover'': After undercover cop Russell Stevens sets up a deal with drug kingpin Hector Guzman to record the transaction, he is followed by a local narcotics detective who scares off Guzman and almost sabotages the whole thing.
* In the 2007 film adaption of ''Film/{{Hairspray}}'', when Tracy participates in the march and hits a cop on the head with her sign and runs away, it gives Velma a good opportunity to stop Tracy from participating in the pageant by having the same police guard the entrance,[[spoiler: making Tracy and the others devise a plan to sneak into the pageant. If Tracy had been bailed out along with Maybelle, she wouldn't have had to hide from the cops and sneak into the pageant!]]
* ''Film/BlueMonkey'': The entire thing is caused thanks to some [[FreeRangeChildren stupid kids]] feeding a parasitic insect a bottle of powdered growth hormone. Up until then, there was only one casualty (the man initially infected with the thing), and the bug was safely contained in a jar. But after eating the hormone the kids give it, the thing grows bigger than a normal human and ends up siring more of its kind. The kids are consequently indirectly responsible the deaths of the nurse who'd been watching the specimen, her boyfriend and several other patients and staff.
** Admittedly, the nurse herself is just as much to blame; the kids wouldn't have been able to have access to the specimen if she hadn't snuck off with her boyfriend to have sex right before they came in.
* {{Film/Snowpiercer}}: The protagonist himself does this twice. First by going on with the revolt which turns out to have been engineered by the train conductor as a way to cull the population and keep the train balanced, and going too far with that ending in more deaths than expected/needed, then again when he tries to intervene and help lil Timmy, which costs the other boy to sacrifice himself to keep the engine going. Then more egregiously the good guys epically mess up by blowing up the side door to the train, which causes an avalanche to cave in and derail the majority of the train, specifically the rear end, where the protagonist and his people have been suffering and trying to leave since the start of the movie.. at the end of the movie the protagonist is dead and while it's not confirmed whether all the other passengers died (except for the girl and the kid) the hero's people are definitely goners, and the train is in bad shape, and the majority of the people are potentially dead, and the only guy who knew how to survive outside is definitely dead, and there's a good chance the only living beings on the planet are a teenage girl, a little boy and a polar bear. You can guess how well that's gonna go for the humans.
** Also done before the movie begins by the scientists who fired into the sky a special missile with a gas meant to reverse global warming. It worked...and caused a new ice age.
* The US Air Force only made things worse in ''Film/ShinGodzilla'' as it's implied Godzilla developed his atomic breath as a result of bunker busters injuring him, where he not only destroyed the bombers, but also lays waste to much of Tokyo and [[spoiler:kills the Prime Minister and much of the Cabinet when their helicopter gets caught in its blast.]]
* ''Franchise/StarWars:''
** ''Film/RevengeOfTheSith''
*** Yoda may have been a great military commander, but he sucked as an emotional counselor. In RealLife, it has been known since time immemorial that platitudes, no matter how well-meant, fall flat on the hurting. Unfortunately, platitudes were all Yoda had for a worried Anakin Skywalker. [[BigBad Darth Sidious]] promised actual help...
*** [[WesternAnimation/StarWarsTheCloneWars Even before that]], Yoda decided to give Anakin a padawan because he believed that training a Jedi until she was fully able to take care of herself would help Anakin learn to let go of his loved ones, freeing him from the fear of loss that could lead him to the Dark Side. Unfortunately, Yoda couldn't anticipate that Ahsoka would [[spoiler: choose to leave the Order before her training was complete (which Yoda himself alongside the rest of the Council caused)]], which only ''increased'' Anakin's fear of loss and inability to let go, pushing him ''closer'' to the DarkSide.
*** And even ''before that'' it's [[WordOfSaintPaul hinted]] that the reason behind General Grievous' StartOfDarkness (and outright stated in Franchise/StarWarsLegends) that the Jedi wronged him in some way, and with the Huk War still being canon, it's possible that the Jedi's accidental enabling of his people's genocide is as well.
*** While Obi-Wan had no choice but to confront an unstable Anakin after his JumpingOffTheSlipperySlope, in spite of his [[DrunkOnTheDarkSide Dark Side corruption]] he was still a WellIntentionedExtremist and powerful enough to take out Sidious himself. By crippling him, Obi-Wan ensured the galaxy would spend the next two decades living under the boot of a monster with both of them powerless to do anything about it. While it eventually brought about the Film/ReturnOfTheJedi (in [[Franchise/StarWarsLegends Legends]]), that's not much comfort to the billions that died in that span of time.
** ''Film/TheLastJedi'' has one of the biggest examples in all of ''Star Wars''.
*** Convinced that Holdo is just ready to take the fleet and fly off, Poe agrees to secretly let Finn and Rose go on a mission to find a splicer, get on the First Order main ship and deactivate the sensors letting them track the Rebel fleet through hyperspace. When Holdo seems ready to go, Poe leads a mutiny to stop her. At which point, [[spoiler: Leia herself knocks Poe out and when he comes too, she tells him that Holdo was following her plan: send transports with the 500 Rebels cloaked from sensors and settle on a hidden base on a nearby planet. The cruiser will go on to lead the First Order away, unaware they're chasing a ghost ship. Holdo wasn't a coward, she was doing exactly what Leia would have.]]
*** Which really ends up blowing up in everyone's faces as [[spoiler: Rose and Finn are caught before they can destroy the device. Then that "charming rogue" splicer not only sells them out in a heartbeat but also gives the First Order codes to track the transports. They soon destroy nearly the entire fleeing fleet and are only stopped by Holdo ramming the cruiser into their ship in hyperspace. But between that attack and a follow-up battle at the now-discovered base, a strong force of 500 people is down to barely thirty.]]
*** In other words, if [[spoiler: Poe had just trusted Holdo and not had Finn and Rose do this (or, conversely, Holdo had kept Poe in line), the plan would have worked and the full Resistance would have been safe.]] If that's not living up the trope, few things do.
*** Holdo herself. If Holdo had discussed the plan with her senior officers, rather than keeping it a secret, not only would she have forestallled the mutiny, she would also have benefited from their input and ensured that, even if something happened to her, other people would be able to execute her plan. By keeping it a secret for no apparent reason, she set a chain of events in motion that quickly spiraled out of control.
*** Earlier on when Luke sense a growing darkness within Kylo Ren, the former actually contemplated on killing him in sleep but even though he realized his mistake, the damage has already been done and it ultimately led Kylo Ren to believed that Luke actually intends to murder him and it ultimately ended up leading him to defect to the Dark Side and kickstarts the plot of the sequel trilogy.

* ''{{Film/Mythica}}'': Because Marek is a necromancer, every time she touches a part of the Darkspore, it alerts Szorlok to that part's location.
* In ''Film/BluesBrothers2000'', Elwood's well-intentioned attempt to deal with the Russian mob threatening Willie's club promptly gets the club burned down.

* In ''Film/TheGuilty'', Asger's attempts to help Iben, a kidnapped woman, end up making things worse:
** He tells Iben to put on her seatbelt and pull the handbrake to incapacitate Michael, her ex-husband and kidnapper, so she can get away from him. It doesn't work, and instead results in Michael putting her in the back of the van.
** He tells Iben to grab a brick and hit Michael over the head when she gets the chance. She does, but since Michael never intended to hurt her, only bring her to the psychiatric ward where she could get the help she needed, it doesn't make anything better. Instead, Michael gets a concussion before he can bring her to the psychiatric ward and Iben herself goes missing.
* In ''Film/TheGravedancers'', the protagonists [[GraveRobbing dig up the physical remains of the ghosts]]--almost getting killed in the process--so they can rebury the bones and lay the ghosts to rest. However, after reburying the bones, the ghosts return, even angrier than before. It is then that Frances reveals that she stole the skulls before the bones were buried so that the ghosts would hang around and she could properly document the existence of the supernatural.
* In ''Film/SonicTheHedgehog2020'', the movie's central conflict happens because Tom shoots Sonic with a tranquilizer dart, accidentally sending all of Sonic's rings to San Francisco. The resulting road trip from Montana to California is because Tom agrees to help Sonic retrieve the rings. On top of this, Tom also handed over one of Sonic's quills to Robotnik since Tom just left it lying around his house instead of hiding it in his pockets.
* ''Film/{{Shrooms}}'': While Jake's reasons for confiscating the group's mobile phones is understandable given the nature of the trips they could have after ingesting the mushrooms, it still isn't exactly a wise idea (arguably). To be fair to him, though, he wasn't to know that the phones would get stolen...

* ''Film/DeadtimeStories'': In "Peter and the Witches", Peter kills Hanagohl to prevent her from sacrificing Miranda and resurrecting her sister Magoga. However, Hanagohl falls on top of Magoga and her blood dribbles into her sister's mouth: completing the ritual and resurrecting Magoga.
* In ''Film/GodToldMeTo'', Pete publishes a newspaper article about the murderers' religious motivation, hoping that once they're acknowledged the killings will stop. He only succeeds in causing panic and riots.
* ''Film/TheHobbit'': When he encounters Gollum in the cave, Bilbo says he's Bilbo Baggins of the Shire. [[spoiler: 60 years later, this information will be tortured out of Gollum by Sauron's soldiers, alerting Mordor to the One Ring's location and forcing Frodo to flee the Shire.]]
* ''Film/BlackChristmas2019''
** The surviving sisters send Landon into the fraternity to act as a distraction. It gets him possessed and almost turned into another murderer. They're lucky Landon actually managed to break the possession.
** Before that, Kris campaigned to get the Hawthorne bust removed from being on display. It got moved within the frat, which is how the brothers discovered its magical powers.
* Willie from ''Film/WheresWillie'' [[HackTheTrafficLights hacks the traffic lights]] in order to give old people more time to cross. He only causes a massive traffic jam. His father sternly orders him not to do any more good deeds.
* What kicks off the plot of ''Film/MightyMorphinPowerRangersOnceAndAlways'' is Billy's attempt to revive Zordon following the [[Series/PowerRangersInSpace Z-Wave]]. Instead, he allows the dispersed evil energy from Rita to possess Alpha 8.

* What kicks off the plot of ''Film/PowerRangersOnceAndAlways'' is Billy's attempt to revive Zordon following the [[Series/PowerRangersInSpace Z-Wave]]. Instead, he allows the dispersed evil energy from Rita to possess Alpha 8.

* The whole plot of ''Film/TheButterflyEffect'' is a series of these.

** Her father's OverprotectiveDad moment, when he stalks her at the mall with her new friends, pushes her away and causes her to accept a ride from Riley rather than from him, resulting in her being sexually harrassed.

*** While Obi-Wan had no choice but to confront an unstable Anakin after his JumpingOffTheSlipperySlope, in spite of his [[DrunkOnTheDarkSide Dark Side corruption]] he was still a WellIntentionedExtremist and powerful enough to take out Sidious himself. By crippling him, Obi-Wan ensured the galaxy would spend the next two decades living under the boot of a CompleteMonster with both of them powerless to do anything about it. While it eventually brought about the Film/ReturnOfTheJedi (in [[Franchise/StarWarsLegends Legends]]), that's not much comfort to the billions that died in that span of time.

* In ''Film/BluesBrothers2000'', Elwood's well-intentioned attempt to deal with the Russian mob threatening Willie's clube promptly gets the club burned down.

* In ''Film/TheBluesBrothers 2000'', Elwood's well-intentioned attempt to deal with the Russian mob promptly gets Willie's club burned down.

* At the end of ''Film/{{Excision}}'', Pauline tries to [[spoiler:perform a lung transplant for her IllGirl sister Grace. It goes about as well as you can expect for a complicated procedure performed by someone with no medical training, little proper equipment, and a garage for an operating room]].

** The sequel ''Film/JurassicWorldFallenKingdom'' has a lot of VillainBall to allow its plot to happen, but the heroes aren't above it with Claire trusting [=InGen=] in the first place, and with her and Owen not breaking off from the delivery group as soon as they can and calling the police to arrest the villains at Lockwood's mansion while the dinosaurs stay in their cages, opting instead for a more chaotic and violent confrontation during the black market auction that ends up releasing the dinosaurs into the wild.

** The sequel ''Film/JurassicWorldFallenKingdom'' has a lot of VillainBall to allow its plot to happen, but the heroes aren't above it with Claire trusting [=InGen=] in the first place, and with her and Owen not breaking off from the delivery group as soon as they can and calling the artillery to arrest the villains at Lockwood's mansion while the dinosaurs stay in their cages, opting instead for a more chaotic and violent confrontation during the black market auction that ends up releasing the dinosaurs into the wild.

** The sequel ''Film/JurassicWorldFallenKingdom'' has a lot of VillainBall to allow its plot to happen, but the heroes aren't above it with Claire trusting [=InGen=] in the first place, and with her and Owen not breaking off the delivery group as soon as they can and calling the artillery to arrest the villains at Lockwood's mansion while the dinosaurs stay in their cages, opting instead for a more chaotic and violent confrontation during the black market auction that ends up releasing the dinosaurs into the wild.

** The sequel ''Film/JurassicWorldFallenKingdom'' contains a lot of VillainBall to allow its plot to happen, but the heroes aren't so above it with Claire trusting [=InGen=] in the first place, and with her and Owen not breaking off the delivery group as soon as they can and calling the artillery to arrest the villains at Lockwood's mansion while the dinosaurs stay in their cages, opting instead of a more chaotic and violent confrontation during the black market auction that ends up releasing the dinosaurs into the wild.

* ''Film/TheCrazies1973'': The doctor Judy works for warns her to flee and gives her some medicine to use against the virus. This action means well but breaks down trust and communication between th police and civilians even more in the short term and [[spoiler:Judy gets killed when she might have survived in quarantine.]]