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6->''"You don't beat this thing, Ripley. You can't. All you can do is refuse to engage. You've got to wipe out every trace. Destroy any clue. Stop its infection from spreading. Make sure there's no chance of the human race ever making contact with it again. Because the moment it makes contact, it's won."''
7-->-- '''Henry Marlow''', ''VideoGame/AlienIsolation''
8
9Naturally, when something bad happens, people tend to not want a repeat of it. Though some are content to just live their life, there are some times where the people involved will do things to ensure that whatever caused the conflict isn't just going to resurface.
10
11If the conflict is a war, and both sides come to a truce, there may be an effort to permanently address the grievances of one or more parties, such that there won't be potential for another war over the same issue in the future when the peace treaty is an old memory. (e.g. If one party started the war because of a lack of key resources, such as food, there may be a mutual effort by both parties to build something which will provide a steady supply for time to come so there won't be a need to fight over food or whatever the resource was again.) If the conflict involves SealedEvilInACan, there may be an active effort to ensure that it is destroyed for good so that future generations won't have to bear the burden of resealing the creature again. Sometimes, a character might [[ScareEmStraight scare another into]] not restarting the conflict. If the conflict started because of something a character did, said character may vow to never do it again, though they could subvert this via AesopAmnesia. Sometimes, a character may [[ScrewThisImOuttaHere get up and leave]]. And sometimes, the trope might be subverted by it happening again [[SnapBack for no apparent reason at all]].
12
13Generally, this serves to add more positivity to an ending by giving the characters a more hopeful outlook on the future. For something to fall under this trope, there needs to be a deliberate effort to a course of action specifically to prevent a repeat of the conflict -- if the conflict is something that can't be repeated just because of the nature of how it was dealt with, but there wasn't an explicit declaration of an intent to do something in particular to prevent such a repeat, it doesn't count. (e.g. if the MacGuffin driving the conflict is incidentally destroyed in the final battle in order to deprive one side of the ability to use it at a crucial moment, it wouldn't count -- but if said [=MacGuffin=] were destroyed by a third party in an effort to get two others to give up their fight, or if it's destroyed or disposed of as part of a truce, it would count.)
14
15Compare LetUsNeverSpeakOfThisAgain, in which the effort is made to ''forget'' the event, but otherwise nothing else is done. Contrast ImNotDoingThatAgain and WeAreNotGoingThroughThatAgain (in which a character(s) says out loud that he/she/they refuse to perform an action again, although whether or not they are successful depends on the circumstances [[GilliganCut and is often shown by the next scene cut]]), TheStoryThatNeverWas (for when a CosmicRetcon undoes the whole plot), HistoryRepeats (for when a historical event happens again), NeverBeHurtAgain (which is one probable reason why these tropes are enacted), CouldHaveAvoidedThisPlot (where it's acknowledged the plot could have been avoided), PutOnAPrisonBus (when the villain is arrested so they won't do any more harm) and HereWeGoAgain (which this trope tries to [[DefiedTrope defy]]). Could be used to stop a ViciousCycle, or overlap with NoManShouldHaveThisPower, AnAesop, RadishCure, ALessonLearnedTooWell, PersonaNonGrata, or StatusQuoIsGod (though just as often, it's an inversion of Status Quo is God).
16
17'''Warning''': All EndingTropes are Administrivia/SpoilersOff by default, so proceed with caution.
18----
19!!Examples
20[[foldercontrol]]
21
22[[folder:Anime & Manga]]
23* ''Anime/GodzillaThePlanetEater'': After [[BigBad Ghidorah]] is vanquished in the final battle, Haruo finds out that Martin is planning to use the alien nanometal to restore human civilization to a pre-Godzilla technological level, then Haruo has a vision of Metphies gloating that Ghidorah will come back to try destroying everything yet again so long as humanity remains obsessed with advancement. To try and prevent this, Haruo flies with the last of the nanometal toward Godzilla, who atomizes it for good.
24* ''Franchise/HelloKitty'': In the cartoon "Replying Properly", Kitty meets a strange creature called the Yeah-what who grows whenever he hears someone say, "yeah?" or "what". Since he appeared when Kitty replied to others too casually, Kitty decides to say, "yes" more often to keep him from coming back.
25* ''Anime/MobileSuitGundamNarrative'': In the aftermath of the disaster that was the pursuit of the Phenex, all data and information about Newtypes and the Psycoframe technology was sealed away as something humanity was just not ready for. By the time of ''Anime/MobileSuitVictoryGundam'', the term "Newtype" is for all intents and purposes a bedtime story told to small children.
26* At the end of ''Manga/{{Naruto}}'', Team 7 just ''barely'' managed to defeat Kaguya, a god-like being that almost takes over their world and reseal her back into the moon. The Black Zetsu, [[GreaterScopeVillain who engineered the entire events of the series]], [[VillainExitStageLeft looks to escape to try his plans again]], only to be found by Naruto who [[KarmaHoudiniWarranty knocks him into the seal as well]] to ensure Kaguya won't be freed again.
27[[/folder]]
28
29[[folder:Comic Books]]
30* ''ComicBook/StarWarsLegacy'': During the gap between volumes 1 (Cade Skywalker's story) and 2 (Ania Solo's story), the Galactic Alliance, the Empire, and the Jedi Order set up a Triumvirate to serve as a FictionalUnitedNations to keep the peace between the galaxy's superpowers so that a repeat of the [[GreatOffscreenWar Imperial-Republic War]] that led to the main conflict of volume 1 can't happen.
31** Also Cade makes sure that Darth Krayt can’t return from the dead again. As he can revive his body with his Sith powers. To ensure he he stays dead, Cade sends his body to Coruscant sun.
32[[/folder]]
33
34[[folder:Fan Works]]
35* ''Fanfic/ArcRoyale'': After the plot-central [[LetsYouAndHimFight battle royale involving the summoned alternate Jaune Arc's]] concludes, the dissatisfied Brother Gods manifest in person and they promptly begin deliberating a ''new'' free-for-all war involving the cast. The surviving heroes naturally want none of it after what they've been put through, and they talk the Gods into just sucking up what they got and leaving the planet alone for good.
36* In the second chapter of the ''Franchise/SonicTheHedgehog'' fanfiction ''Fanfic/BigSisterBunny'', Vanilla begins to [[{{Sleepwalking}} sleepwalk]] and narrowly avoids a bunch of perils (including nearly being run over by a van and almost falling off a building). At the end, Ice decides to keep the bedroom door closed tightly at night so that Vanilla won't be in such danger in case she sleepwalks again.
37* ''Fanfic/EmpireOfThePacific'': The inciting incident is that Lilo and Stitch use Jumba's time-traveling board to prevent the accident which killed Lilo's parents, and this creates an AlternateTimeline where Stitch's alternate self is a psychopathic "emperor" dictator. After Lilo and Stitch defeat the Emperor and set history back on its original track, Lilo destroys the time board just to be sure.
38* ''[[https://www.fanfiction.net/s/12471416/1/Game-On Game On]]'' (based on ''WesternAnimation/TheLoudHouse'') ends with Lynn promising to never let her aggressive play get to the point where she and her brother Lincoln have as extreme a fight as they did in the story again.
39* In the third chapter of ''Fanfic/HatchYaLater'' (link [[https://archiveofourown.org/works/46934785/chapters/118532515 here]], a ''Anime/PrettyCure'' fanfic), Mepple and Mipple's egg is [[IHaveYourWife kidnapped by Kabaton]]. After the egg is saved, Nagisa (who has been looking after the egg) opts to lock her windows and the front door to keep Kabaton from sneaking in again.
40* ''Fanfic/{{Jessica}}'': The story's conflict is jumpstarted by Cameron unintentionally cracking his cartridge of ''VideoGame/PokemonYellow'', which [[AccidentalMurder ends up killing everyone on his Pokémon team, most prominently Jessica the Raichu]]. When he plays ''[[VideoGame/PokemonBlackAndWhite Pokémon Black]]'', the Pikachu he caught reveals herself to be Jessica, and [[TheReasonYouSuckSpeech she tears him a new one for his carelessness]]. Cameron apologizes to her, and she decides to forgive him. At the end, Cameron says that he has not deleted the save file of any of his games since, and he has made sure not to destroy them again so that he will not incur Jessica's wrath.
41* ''Fanfic/KarmicBacklash'': In this RecursiveFanfiction to ''Fanfic/TheKarmaOfLies'', the whole mess of this duology[[note]]to make a long story extremely short, it's yet another "salt fic" and neither Lila [[TookALevelInJerkass nor Marinette]] come across smelling like roses by the end[[/note]] eventually [[DeconstructedCharacterArchetype deconstructs]] the "RecruitTeenagersWithAttitude" trope by putting the blame on the Miraculous holders and Marinette as a Guardian having too much "attitude" and not enough emotional maturity, to the point the Guardians come to take the Miracle Box away in the story's epilogue and make clear there is no way in Hell they are going to allow recruitment standards to become this loose ever again.
42* ''Fanfic/ALoadOfBulk'': Lana drinks a chemical she found in Lisa's laboratory, which causes her to become ripped and [[JerkassBall gives her a shocking change in personality]]. Later, she nearly dies from the contents of the formula, and she promises herself not to touch anything in Lisa's lab without permission again. Lisa also decides to keep anything particularly dangerous out of reach.
43* ''Fanfic/MaxAndRuby0004'': Subverted at the end. After viewing the disturbing content of the ''WesternAnimation/MaxAndRuby'' DVD, the narrator smashes the disc and stuffs the pieces down the sink's drain to avoid having to watch it again. Though nothing unusual happens for a while, he later gets a note from an anonymous source that says, "Death is our only release" (something that had been said in the aforementioned DVD).
44* ''Fanfic/TheNegotiationsverse'': In an effort to convert humanity into "peaceful and harmonious" ponies, Princess Celestia starts the Conversion War, which lasts five years and leads to untold amounts of death and destruction on both sides. She is able to do this because of her godlike power and authority as an alicorn. After the war, her student and successor Princess Twilight destroys the Scroll of Ascension to prevent any more alicorns from ever being created, deciding NoManShouldHaveThisPower.
45* ''Literature/NESGodzillaCreepypasta'': Played with in the end. Zachary considers destroying the titular hacked ''VideoGame/GodzillaMonsterOfMonsters'' game in case Red goes after him again, but he decides not to, as finishing the game had set Melissa's soul free. He decides to sell it online instead, but he advises anyone who buys it to shut the game off if they feel like it's messing with their mind.
46* ''Fanfic/{{Null}}'': After [[CorruptCorporateExecutive Matthew Fields]], who has been spearheading Atlas' evil GovernmentConspiracy and set off the entire plot, is killed, the final chapter reveals that Ironwood, Neo, and Jaune are now working together from the shadows to kill off and purge all the surviving elements of the conspiracy who have escaped exposure, explicitly preventing Fields' co-conspirators from promptly reviving his work and picking up where he left off.
47* ''Fanfic/PonyPOVSeries'': Nightmare Eclipse, the BigBad of the [[BadFuture Dark World]] arc, has been keeping the timeline in an endless 1,000-year GroundhogDayLoop to punish Discord for all eternity. After she is defeated and the loop is finally broken, one iteration of Rainbow Dash -- specifically the one Eclipse brainwashed into Nightmare Manacle -- ascends to alicornhood and becomes Princess Fidelitas, the Goddess of Breaking Loops and Cycles, with the power to stop any being like Eclipse from ever coming into existence again.
48* ''Fanfic/SonicExe'': Subverted. Kyle advises Tom to destroy the ''Franchise/SonicTheHedgehog'' disc so that X won't haunt him or anyone else, but [[CuriosityIsACrapshoot Tom is too curious about the game]], so he plays it anyway. This results in him being traumatized by the game's violence and it's implied that X comes for him in the end.
49* ''Fanfic/TheWarOfTheMasters'': In ''Fanfic/PearShaped'', Kanril Eleya expresses a hope that the peace negotiations between the Federation and the Klingon Empire will involve them settling the disputed spinward-rimward border "so that my kids don't have to go through this, too." In the ''Franchise/StarTrek'' setting, the then-current war is at least the ''fourth'' time the two superpowers have fought over that part of space.
50* ''Fanfic/WhatYouWishFor'': At the end, Lori burns her sister Lucy's ouija board so that she won't end up summoning another demon. Played with, however, since the story was AllJustADream so Lucy had never truly summoned a demon. Lori was just trying to play it safe.
51* ''Fanfic/WileECoyoteLostEpisode'': The narrator becomes so frightened by the graphic violence of the ''WesternAnimation/WileECoyoteAndTheRoadRunner'' DVD that they crush it and throw it out in the hopes that no one else will watch it. They then warn the audience not to watch the episode if they find it anywhere.
52[[/folder]]
53
54[[folder:Films -- Animated]]
55* ''WesternAnimation/FerngullyTheLastRainforest'': When a logging outfit starts to clear-cut a pristine forest, they unknowingly release the [[SealedEvilInACan sealed evil in a tree]] that is Hexxus, the amorphous embodiment of destruction, desolation, and death. Hexxus takes control of the Leveler and rolls toward Ferngully. It takes almost every sprite and fairy in Ferngully to stop Hexxus and seal him up once more inside a living tree.
56* ''WesternAnimation/HeavyMetal2000'': When an ordinary asteroid miner discovers the crystal key to the Chamber of Immortality, he loses his sanity, and leaves a wake of bodies in his path. Although the man himself doesn't enter the chamber, Odin TheMole does, seeking to reclaim his birthright as oppressor of the galaxy. TheHero Julie removes the key, sealing Odin inside. JokeCharacter Zig takes the key and launches himself into space, where his body becomes indistinguishable from the many other asteroids nearby.
57* ''WesternAnimation/TheLandBeforeTimeIITheGreatValleyAdventure'': Littlefoot and his friends had unknowingly brought a Sharptooth egg into the Great Valley and attracted its parents to look for it. After Littlefoot let the baby Sharptooth Chomper go back to his parents in the Mysterious Beyond, the adults of the Great Valley sealed the entrance so the Sharpteeth won't come back.
58[[/folder]]
59
60[[folder:Films -- Live-Action]]
61* ''Film/BackToTheFuturePartIII'': [[spoiler: After Marty had come back to 1985 from the Wild West, the Delorean time machine was hit by a train and broke into a million pieces. Marty couldn't fix it due to the fact that time traveling is dangerous. It also meant that the time machine could never be used again.]]
62* ''Film/BladeII'': Near the movie's ending, the vampire king Eli Damaskinos reveals he has a tank full of experimental vampire fetuses in his lair because he's been trying to create modified vampires that [[DaywalkingVampire can walk in sunlight]], and his experiments created the [[TheVirus Reaper virus]] which [[EnemyMine both the heroes and vampires]] have spent the movie trying to contain. After Blade kills Damaskinos' [[TheDragon lieutenant]] Reinhardt and goes after Damaskinos himself, Whistler goes out of his way to destroy the tank, ensuring that Damaskinos' work can't continue and will die with the villains.
63* ''Film/{{Click}}'': After David Newman had experienced what the future might be if he focus more on his job with a universal remote, he goes home and decides to spend time with his family. He received a card from Morty along with the universal remote which he used throughout the movie. David throws the remote in the trash so he can never use it again.
64* ''Film/{{Dragonheart}}'': When young prince Einon receives a grave wound during a peasant uprising, a dragon agrees to donate a piece of his heart to magically heal Einon. Sadly, when Einon ascends the throne, he becomes more tyrannical than his father. And because he has a piece of dragon heart in him, Einon becomes almost deathless and nearly invincible. Only a HeroicSacrifice by the dragon that donated the heart piece can put Einon to rest forever.
65* ''Film/DumbAndDumber'': At the end of the prequel ''When Harry Met Lloyd'', Lloyd and Harry promise each other not to let another woman jeopardize their friendship again after their relationship nearly comes to blows over Jessica. Subverted, as the previous movie had shown that [[AesopAmnesia the same thing would happen again years later]] when [[GreenEyedMonster Lloyd became envious of Harry's relationship with Mary]].
66* ''Film/HarryPotterAndTheDeathlyHallowsPart2'': After Harry had successfully defeated Lord Voldemort, he gains possession of the Elder Wand. But he breaks it in half so nobody in the Wizarding World can use it again.
67* ''Film/HellboyIITheGoldenArmy'': After defeating Prince Nuada in a duel and claiming the crown that controls the mechanical Golden Army, Hellboy seems momentarily tempted by the power the crown offers; Liz responds by taking the crown from him and melting it with her pyrokinesis, shutting the Army down forever.
68* Attempted by Kirsty Cotton and her boyfriend in the first ''Film/{{Hellraiser}}''. After getting rid of Pinhead and his fellow Cenobites, they throw the Lament Configuration into some burning rubble so that no one will ever experience its horrors. Unfortunately, the same hobo that greeted Kirsty earlier in the movie reveals his true demonic form and retrieves the box before flying away.
69* In most of the ''Film/{{Jumanji}}'' films so far, the titular game is destroyed or otherwise put away in a fashion which the people who dispose of it hope will make this trope happen, but [[ClingyMacGuffin the damned thing]] is [[SubvertedTrope harder to get rid of than that]]:
70** The first film's prologue has two brothers burying the game deep in the New England woods in the 1880s only for it to be discovered by Alan Parrish in TheSixties, and that film ends with Alan and Sarah tossing the game into the river, only for the epilogue to show that it emerged on some beach in the Middle East in 1995.
71** ''Film/JumanjiWelcomeToTheJungle'' starts with Spencer and his unwanted RagtagBunchOfMisfits discovering the game in a room in their school (which had turned into a videogame cartridge when a previous player decided not to play because it was a tabletop one) and ends with them smashing the cartridge and console with a bowling ball to prevent anybody from playing again.
72** ''Film/JumanjiTheNextLevel'' begins with Spencer repairing the game because he felt it was the only place where he could be awesome. The film then makes perfectly clear near the end that ''Jumanji'' can never be destroyed, with another player unleashing its power.
73* ''Film/TheMask'': Stanley Ipkiss uses a magic mask to become his alter ego "The Mask". It makes him go crazy and gets into trouble with the law. In the end, Stanley throws the mask into the sea so he can never use it again.
74* ''Film/Terminator2JudgmentDay'': Seeking to preclude [=SkyNet=] from ever being created, the protagonists visit Cyberdyne Systems, where they obliterate the place with explosives. Afterward, the only remnants of terminators are 1) the chipset that Dyson had been reverse engineering, 2) the robotic arm of the terminator from the first Franchise/{{TheTerminator}} movie, and 3) the reprogrammed T-800 that has been aiding Sarah and John Connor. The first two pieces are tossed into a steel smelter, and the T-800 makes a HeroicSacrifice to expunge all traces of terminator technology. Alas, a StableTimeLoop demands that terminators must exist, so [=SkyNet=] finds alternate means of coming into existence in future installments.
75[[/folder]]
76
77[[folder:Literature]]
78* In the ''Film/TwentyEightDaysLater''/''Film/TwentyEightWeeksLater'' tie-in graphic novel ''28 Days Later: The Aftermath''; the final book ends with Sophie killing Clive, a surviving scientist who helped create the Rage virus, so that [[ZombieApocalypse what his creation has done to the entire mainland of Great Britain]] can never happen again. Tragically, ''Weeks'' shows that that's what happens, with the film's ending implying that it'll ultimately be even worse and more widespread than the first outbreak that destroyed an entire country.
79* ''Armadillo Tattletale'': Throughout the story, Armadillo uses his SuperHearing to eavesdrop on conversations and spread slander about others. Eventually, Alligator has had enough of this and [[EarAche tears his ears to shreds]] so that he won't be able to hear as well, and as such, he cannot listen in on private conversations anymore.
80* In ''Literature/TheAngloAmericanNaziWar'', once the Allies end World War 2, they become determined to ensure that a conflict of its sheer scale can never happen again. This means permanently dividing Germany into 15 districts, and [[NoKillLikeOverkill orbitally bombarding the city of Stettin]], killing ''275,000 people'', [[DisproportionateRetribution because there was an armed bid at reunification within its borders]].
81* ''Literature/ArcOfAScythe'': At the end of the third book Scythe Faraday activates the failsafe the original Scythes created in case the system got out of hand. The failsafe is a disease that kills random people at regular intervals and it also removes the Scythes' ability to kill people. The series was caused by the Scythedom becoming filled with sadists twisting its ideals so removing their power keeps this from ever becoming a problem again.
82* At the end of ''Baby's First Train Robbery'', the train staff decide to disallow babies on the train, so that [[BrainyBaby Baby Frank]], or any other baby, won't steal it again.
83* ''Literature/TheBippoloSeedAndOtherLostTales'':
84** At the end of "Gustav the Goldfish", the narrator decides never to overfeed Gustav again lest he [[AttackOfTheFiftyFootWhatever grow whale-sized again]].
85** "Steak for Supper", in which some animals overheard the boy mention having steak for supper and follow him home, ends with the boy deciding never to talk on his way home from school again.
86* In ''Literature/ABadCaseOfStripes'', [[EasilyEmbarrassedYoungster Camilla]] is too embarrassed to eat lima beans because [[StockYuck her classmates hate them]]. However, when she gets a disease that makes her change shape and colour when people mention things, and the cure is lima beans, she decides to eat them anyway from then on.
87* ''Literature/CaptainUnderpants'': George and Harold made a ton of Captain Underpants comics which some of them made fun of their teachers and a classmate named Melvin Sneedly. It also made the boys hypnotize their mean principal into Captain Underpants and were forced to help him out. At the end of "The Sensational Saga of Sir Stinks-A-Lot", George and Harold quit making Captain Underpants comics due to the fact that the character has caused them enough trouble already. So they created [=DogMan=] comics instead.
88* In the kids' book ''Clayton Parker Really, Really, Really Needs to Pee'', Clayton has a PottyEmergency. He then decides to prevent it from happening again by always trying to pee before going on trips.
89* ''Literature/CliffordTheBigRedDog'': In "Clifford's Pals", Clifford and several other dogs wander into a construction site. [[DoesNotKnowHisOwnStrength Clifford ends up causing unintentional property damage due to his strength]] and the rest of the dogs get into other mischief, so they decide to never go near another construction site again.
90* In ''Literature/TheDiggingestDog'', the narrator, a dog named Duke, accidentally digs a well and nearly drowns. At the end, he says that he's "careful" now when he digs so he won't dig another well.
91* ''Literature/EmilOfLonneberga'': In one story, Emil [[IntoxicationEnsues accidentally gets drunk]] off expired cherries. This makes his mother very disappointed in him even though it was an accident, partly because he's a child and partly because the family is Lutheran (Lutherans frown on drunkenness). At the end of the story, it notes that because of this incident, Emil became TheTeetotaler when he grew up.
92* In ''A Fish Out of Water'', a boy overfeeds his fish Otto, who grows to the size of a whale. At the end, he decides never to overfeed Otto again.
93* ''Literature/FrannyKStein'': Double-subverted in "Frantastic Voyage". Igor becomes too engrossed by the TV to help Franny [[FantasticVoyagePlot while she's trapped in his body]]. When Franny finally escapes (by being belched out), she attempts to destroy the TV, but Igor distracts her by turning on [[NightmareFetishist a show about baby spiders]]. She does like the show, but she tells him not to become too obsessed with watching TV again.
94* ''Literature/TheGiver'': When the previous Receiver-in-Training applied for Release (read as: death) due to being overwhelmed by the memories given to her, the Community briefly experienced the memories she had received over the course of six weeks. Distressed by the incident, the City Council thereon enforces a new rule saying that Receivers can't apply for Release by the time Jonas is selected to be trained.
95* In ''Golly Gump Swallowed a Fly'', Golly often yawns with his mouth wide open, leading to him [[SwallowedAFly accidentally swallowing a fly]]. After his various attempts to get rid of the fly finally work, he decides to cover his mouth when he yawns from now on.
96* ''Literature/HarryPotterAndThePhilosophersStone'': Professor Dumbledore had destroyed the Sorcerer's Stone so Lord Voldemort won't use it to become immortal.
97* ''Literature/ICanLick30TigersToday'': In "The Glunk That Got Thunk", the protagonist's sister is [[MrImagination very imaginative]], but one evening, she imagines a monster called a Glunk, who [[{{Tulpa}} comes to life]]. At the end, she agrees never to think up a monster again.
98* Subverted in ''I Really, Really, Really Need a Wee/to Pee''. The story follows a bush baby looking for a place to urinate, and at the end, she decides to never leave the house without ensuring she doesn't need the bathroom so it won't happen again. However, it doesn't work, since the story then ends with her either (depending on the release) needing to poo, or needing to pee again.
99* Zigzagged in ''Literature/JeremyFisher''. The eponymous [[FunnyAnimal anthropomorphic frog]] tries to fish but narrowly escapes being eaten by a fish. At the end, he decides never to go fishing again, but a later book, ''Literature/GingerAndPickles'', has him trying on galoshes, so maybe he changed his mind. Then again, it's never outright said that he wanted the galoshes to fish.
100* Played with in ''Literature/ALionInTheMeadow''. In it, a boy notices a lion in the meadow, but his mother thinks he's "making up stories". She tries to humour him by making up a "story" of her own -- that a match box has a dragon in it, which will grow to full size and chase the lion away. However, [[AccidentalTruth the story turns out to be true]], and there ''is'' a dragon. Originally, the story ended with the mother refusing to make any more stories up lest they come true, but later editions omitted this ending since Creator/MargaretMahy feared it would make children afraid to make up stories.
101* ''Literature/LittleGoldenBooks'': In ''The Big Brown Bear'', the titular bear sneaks to an old tree for some honey, despite [[WomenAreWiser his wife]]'s warnings. He ends up being [[NasalTrauma stung on the nose]] by a [[ScaryStingingSwarm swarm of bees]], and he decides to never get too close to that specific tree again.
102* In ''The Little White Lie'', a girl lies, which then leads to a SnowballLie. At the end of the story, she decides [[WillNotTellALie never to lie again]] (though it's up in the air whether that's true or not since the narrator admits to not believing it).
103* The entire story arc of ''Literature/TheLordOfTheRings'' trilogy involves destroying the One Ring of Power, forged by Sauron to take control of the kings of elves, dwarfs and humans. Sauron's EvilPlan nearly succeeded in giving him absolute mastery over Middle Earth, until King Isildur severed the hand of Sauron in combat, depriving him of the ring. Alas, Isildur could not destroy the ring, and it was lost during an ambush, ultimately lying in a creek bed for centuries. When the One Ring is found, it isn't immediately recognized, but when it is, a party of adventurers is formed to unmake it in the fires of Mount Doom. This done, Sauron's SoulJar is also destroyed so that he can nevermore threaten Middle Earth.
104* Downplayed at the end of ''Literature/MonstersEatWhinyChildren''. When two kids named Henry and Eve go through a phase where they whine a lot, some monsters who specifically look for the whiniest kids to eat kidnap them and try to cook them. Henry and Eve escape, and the narration says that they ''usually'' never whined again, but still did on occasion.
105* In "The Repairman" by Creator/HarryHarrison, a primitive race that had a hyperspace beacon on their planet have been [[CargoCult worshipping it as part of their religion]] and had accidentally turned it off. After the narrator fixes it, they attempt to keep him in as a caretaker. He uses the opportunity to weld the door shut and state that the gods have forbidden further entry to anyone for such disrespect.
106* ''Literature/SamPig'': In one episode, Sam falls unnoticed into a steamed pudding being cooked by the Irish Cook, who put some amulets into it for good luck. When Sam escapes and is mistaken for a leprechaun, the Irish Cook (who [[DramaticIrony never finds out that Sam isn't a leprechaun]]) decides she will never put an amulet into a pudding again.
107* In the ''Literature/SerendipityBooks'' book ''Feather Fin'', the titular fish Feather Fin is curious about what's above the sea, despite his mother's warnings. He crawls onto the shore and [[OhCrap realizes too late]] that, as a fish, he can't breathe oxygen, and he nearly suffocates until a wave pushes him back into the ocean. Afterwards, he vows never to go to the surface again.
108* Subverted in ''Literature/TheSilmarillion''. The War of Wrath between the [[OurGodsAreDifferent Valar]] and the [[FallenAngel fallen Valar]] turned DestroyerDeity Morgoth is immensely destructive with countless dead, including sinking the continent of Beleriand beneath the sea. As a result, the Valar decide to no longer use their power to directly intervene in the war against evil to prevent such destruction in the future. Subverted in that, unfortunately, this makes things all the more difficult when [[Literature/TheLordOfTheRings one of Morgoth's lieutenants creates problems down the line]].
109* In ''Literature/SnotStew'', Kikki and Toby hear their owners' kids having [[ArgumentOfContradictions contradicting arguments]], so they decide to do the same thing and think it's a game called "snot stew". Toby [[BigBrotherBully goes too far with it]] and steals Kikki's food, and he ends up getting stuck in the fence due to his BalloonBelly. His [[AttackTheTail tail gets torn off]] by a vicious dog named Butch, so he and Kikki promise each other not to play "snot stew" afterwards to keep an incident like that from occurring again.
110* ''Literature/{{Struwwelpeter}}'': In ''The Story of Little Suck-a-Thumb'', a boy is [[StillSucksThumb a frequent thumb-sucker]]. His mother hires a tailor to [[{{Fingore}} cut his thumbs off]] with shears so that he'll never be able to suck them again.
111* In ''Thomas's Snowsuit'', a BrattyHalfPint named Thomas fights whoever tries to put him in his snowsuit. At the end, his principal moves to a country where it doesn't snow, so that he won't ever have to fight with any kids over snowsuits again.
112* In the children's book ''The Tiger Who Came to Tea'', a tiger comes over and [[BigEater eats all the food in the house]]. The family later buys a can of "tiger food" in case he comes back, so he'll eat that instead. It turns out to be pointless, however, since he never does come back.
113* In ''Truth Farts'', a boy named Billy lies that he didn't eat a blueberry pie, only to get busted when [[ToiletHumour he farts and his fart smells of blueberries]]. He [[HonestyAesop swears to never lie again]] lest another "truth fart" happen.
114* ''Literature/WarriorCats'':
115** The cat possessing Bramblestar spends the seventh arc, ''The Broken Code'', using the warrior code to tyrannically persecute those who break it and getting away with it because he is [[FakeKing believed to be the Clan leader]], and the Code says the leader's word has the force of law. He especially targets cats who had forbidden lovers in other Clans, which includes two of the arc's main characters, Bristlefrost and Rootspring. [[spoiler:The difficulty of making an illegal relationship work delays the two from getting together, and in the end Bristlefrost dies before they have a chance.]] The arc ends with the Clans changing the Code to avoid such a thing happening again. Now leaders can be deposed if enough of the Clan votes to have this happen, and there is a legal way for cross-Clan lovers to switch Clans and be accepted into a new one.
116** In ''Code of the Clans'', One-Eye and Dappletail nab some fish from [=RiverClan=] out of curiosity. Hailstar and Pinestar try to talk them out of it, but they stubbornly insist on trying it. The two find out too late that [[DoesNotLikeSpam they can't stand the taste of fish]] and beg the higher-ups not to make them finish it. After that, they decide never to eat fish again.
117* In ''When I Chopped My Toe'', a boy [[AgonyOfTheFeet injures his toe while chopping wood barefoot]]. At the end, he says that he wears boots now when he chops wood so it won't happen again.
118[[/folder]]
119
120[[folder:Live-Action TV]]
121* ZigZagged in ''Series/BabylonFive''. The eponymous SpaceStation was built to host a FictionalUnitedNations to prevent a repeat of the apocalyptic [[GreatOffscreenWar Earth-Minbari War]] by providing a setting for the nations of TheVerse to hash out disputes peacefully. It ultimately is agreed to have failed by the end of season 2, with the reconquest of the Narn Regime by the Centauri Republic, but TheAlliance against the Shadows and the growing authoritarianism in the Earth Alliance allows the protagonists to reforge the Babylon 5 Advisory Council into the more effective Interstellar Alliance, which isn't able to ''completely'' end war but is able to police it. This trope figures heavily into the resolution of the Shadow War arc. By refusing to choose a side in the millennia-long conflicts between two races of AbusivePrecursors, and evicting both races from the galaxy for their bad cosmic parenting, a future flare-up of these {{Precursors}}' tensions is prevented once and for all.
122* ''Series/TheBrittasEmpire'': In "[[Recap/TheBrittasEmpireS2E7NewGenerations New Generations]]", Carole gives birth, but thanks to Brittas, she ends up being tended to in a sauna by a vet. A series later, in "[[Recap/TheBrittasEmpireS3E6TheStuffOfDreams The Stuff of Dreams]]", Helen, remembering this incident, asks Laura to take her to the hospital for when she gives birth, figuring that with Brittas out of the way, she would get a normal delivery. Of course, Brittas ends up driving her and she ends up giving birth in the middle of the high street anyway.
123* This is the focus of the later parts of ''Series/{{Chernobyl}}'', with the main characters figuring out what exactly caused the [[GoingCritical accident]] and trying to tell everyone about it to prevent it from happening again, though they are reluctant to do this due to personal consequences of defying the official government line.
124* ''Series/{{CSINY}}'': In "[[Recap/CSINYS09E11 Command+P]]", a young man develops a way to 3-d print a working handgun and sets up a meeting in a bar with an investor named Andy Stein. Unfortunately he encounters a guy named Andy Lewis first, doesn't verify his last name and launches into his spiel. Lewis follows him home, shoots him with the prototype, and steals the printer and software. Later he fatally shoots someone else with it. The investigators are now faced with two shooting deaths without ballistics, serial numbers, etc. After they figure it out and confiscate everything, Mac tells Jo that once the trial is over, they'll send the printer to a local university and keep the software locked up in evidence in hopes that no one else will start printing unlicensed, untraceable guns at home.
125* ''Series/TheExpanse'': At the end of Season 6, James Holden uses LoopholeAbuse to put Camina Drummer in a legitimate position of power within the new Earth-Mars-Belter coalition, whereas Avasarala wanted to maintain Drummer as a sympathetic figurehead to quell any further Belter rebellions. Holden points out that the "Inners" will have to give the Belters some real concessions in the future, as their constant abuse of the Belt colonies has already resulted in one devastating interplanetary war and gave terrorist warlords like Marco Inaros the ability to gain so many supporters.
126* ''Series/{{MASH}}'': Discussed and Downplayed. In one episode, the 4077 is desperate to get ahold of some penicillin, as their supply was stolen. Father Mulcahy decides to arrange a swap on the Black Market and accepts whatever others are willing to donate to obtain the medicine. Maj. Winchester is cajoled into donating some of his fine wine but insists on coming along to try and talk the Black Marketeers into a lower price. He ends up insulting them, is stripped down to his long underwear, and they nearly leave empty-handed, until Mulcahy realizes the Black Market thugs be distracted with drinking the wine they acquired. He and Winchester succeed in stealing the needed penicillin. Col. Potter is impressed that Mulcahy took Winchester along.
127--> '''Mulchahy:''' Having him along was a real...blessing. And God willing, I'll never be blessed with him again.
128* ''Series/SesameStreet'':
129** In one song, the main character [[PlatonicKissing kisses]] a "blueberry-beaked budgie", but then that leads to him contracting a strange disease that makes him lethargic and grow blueberries on his head. The song ends with him refusing to kiss any more fruit-themed animals.
130** In one skit, a bear, after being [[ScaryStingingSwarm chased by a swarm of bees]], decides to never mess with bees again.
131** Subverted. One episode involves Abby casting a spell on Elmo and Zoe, causing a lot of hats to stack on their heads, which leads to total chaos. At the end of the episode, she promises never to use the spell again, but this promise doesn't work since she accidentally casts it.
132* ''Franchise/StarTrek'':
133** ''Series/StarTrekTheNextGeneration'':
134*** In "[[Recap/StarTrekTheNextGenerationS1E22SkinOfEvil Skin Of Evil]]", after they save Troi from Armus, the ''Enterprise'' destroys the wrecked shuttlecraft and puts a beacon in orbit warning all ships to stay away from Vagra II.
135*** In "[[Recap/StarTrekTheNextGenerationS4E14Clues Clues]]", aliens [[LaserGuidedAmnesia erase a day from the crew's memory]] so they won't find out about their existence. However, it doesn't work since the crew notices some things are out of place (Crusher's moss displays a day's worth of growth, Troi is dizzy and feels her reflection isn't herself, and Worf's wrist is injured). The crew decides to let the aliens wipe their memories a second time, but this time, ensure no clues are left behind so the conflict won't start again.
136*** In "[[Recap/StarTrekTheNextGenerationS6E5Schisms Schisms]]", some sensor modifications attract aliens from another dimension. Once they're dealt with, Geordi says that they'll change the modifications to not interact with that particular dimension again.
137*** At the end of "[[Recap/StarTrekTheNextGenerationS6E24S7E1Descent Descent]]", Data dismantles Lore, his EvilTwin, so that he can no longer do any damage.
138** ''Series/StarTrekDeepSpaceNine'':
139*** In "[[Recap/StarTrekDeepSpaceNineS02E13ArmageddonGame Armageddon Game]]", after the biological weapon used in the war between the T'Lani and the Kelleruns is destroyed, the governments of the T'Lani and Kelleruns decide to kill off anyone with the technical knowledge about it, to ensure that the virus in question will never be recreated.
140*** "[[Recap/StarTrekDeepSpaceNineS04E09TheSwordOfKahless The Sword of Kahless]]" involves two [[ProudWarriorRace Klingons]] fighting over the eponymous sword, to the point of becoming homicidal towards each other. At the end, Dax throws the sword into space to prevent more fighting.
141*** In "[[Recap/StarTrekDeepSpaceNineS05E16DrBashirIPresume Dr. Bashir, I Presume?]]", it's revealed that in response to the wars previously caused by genetically enhanced people, [[NoTranshumanismAllowed the Federation had outlawed genetic enhancements and restricted the rights of genetically enhanced individuals]]. For this reason, Dr. Bashir, who is genetically enhanced, had taken great effort to hide this fact.
142---->'''Admiral Bennett:''' Two hundred years ago we tried to improve the species through DNA resequencing, and what did we get for our trouble? [[Recap/StarTrekS1E22SpaceSeed The Eugenics Wars]]. For every Julian Bashir that can be created, there's a [[Film/StarTrekIITheWrathOfKhan Khan Singh]] waiting in the wings. [[SuperSupremacist A superhuman whose ambition and thirst for power have been enhanced along with his intellect.]] The law against genetic engineering provides a firewall against such men and it's my job to keep that firewall intact.
143** ''Series/StarTrekVoyager'': In [[Recap/StarTrekVoyagerS6E14Memorial "Memorial"]], the ''Voyager'' crew keep getting PTSD-like symptoms, which turn out to be because of a device intended to remind some aliens of a war (in hopes of preventing another war). At the end, Janeway decides to put up a warning near the device so that no other people will go too near and have the mental tampering.
144** ''Series/StarTrekDiscovery'': After a season is spent fighting a time traveling [[AIIsACrapShoot Artificial Intelligence that came from the future to destroy all sentient life]], it is decided that the only way to avoid a repeat is to completely erase all knowledge of the event. This includes destroying all references to the Klingon time crystals, the {{time travel}} capable suit created by the Starfleet's [[SinisterSpyAgency Section 31]], declaring the [=USS=] Discovery destroyed in battle against a rogue Section 31 Captain, removing all references to [[RememberTheNewGuy Commander Michael Burnham]] to the point that Spock's future Captain and crew mates will never even know she existed, and swearing any one with knowledge of the event to secrecy upon penalty of death for treason if they ever mention the event again.
145[[/folder]]
146
147[[folder:Multi-Media Franchises]]
148* ''[[UnfinishedEpisode/DoctorWho Doctor Who and the Krikkitmen]]''[[note]]an unfilmed serial script written by Creator/DouglasAdams for the 15th season, it would later be resurrected for ''Radio/TheHitchhikersGuideToTheGalaxy1978'' and a ''Hitchhiker's'' novel ''Literature/LifeTheUniverseAndEverything'' before finally being adapted as a ''Doctor Who'' work in a novelization by James Goss[[/note]] revolves around a resurgence of the legendary Krikkitmen, killer androids from the planet Krikkit, whose population became a race of [[AbsoluteXenophobe absolute xenophobes]] once they find out they are not alone in the universe. After a destructive war that threatened the whole of the Universe, the Time Lords finally had enough of it and locked the planet Krikkit in a Time Lock, meanwhile sealing the entirety of the Krikkitmen away on the Time Lord prison planet of Shada, which was in another dimension accessible only by use of the Ancient and Worshipful Law of Gallifrey.[[labelnote: Why weren't they dismantled?]] There was a fierce debate about whether or not the Krikkitmen were sentient and if so whether they could be just executed ''en masse''.[[/labelnote]] [[OhCrap However, the Time Lords apparently missed a few]], who are trying to release Krikkit and the Krikkitmen and get the omnicide back on track.
149* ''Franchise/{{Transformers}}'':
150** ''ComicBook/TheTransformersMarvel'':
151*** After the devastation left in the aftermath of the arrival of the Transformers on Nebulos, the Nebulans developed a formula that poisoned all their fuel sources in order to create a hostile environment for any Transformers who came calling. The Decepticons Darkwing and Dreadwind ground to a halt due to this poisoning, and a group of Autobots led by Goldbug who came to Nebulos hoping to revive Optimus Prime likewise found themselves on the brink.
152*** In the aftermath of the UK-exclusive "Time Wars" storyline (where space and time almost collapsed due to the presence of Galvatron, Cyclonus and Scourge, exacerbated by Cyclonus dying more than twenty years before he was even created), both Future Autobots and Decepticons resolve to destroy all their time machines in order to prevent even the remotest chance of such a catastrophe happening again.
153** ''WesternAnimation/BeastWars'':
154*** In the episode "Chain Of Command", Optimus Primal was captured by the Predacons and the remaining Maximals were hobbled by the fact that they don't have an actual plan for this situation. [[DemocracyIsFlawed An attempt at voting for a new leader failed due to being split down the middle]], until Optimus managed to send a message putting Rattrap in charge. In the aftermath, the Maximals organised a proper chain of command in order to prevent such a blunder from happening again.
155*** Invoked in the backstory of Rampage. He was created by the Maximal Elders in an attempt to duplicate the immortal [[OurSoulsAreDifferent Spark]] of [[WesternAnimation/TheTransformers Starscream]] [[note]]In ''The Transformers'' Starscream famously continued to exist as a ghost after his death in ''WesternAnimation/TransformersTheMovie'', in ''Beast Wars'' this was claimed to be because he had a mutant Spark[[/note]]. They succeeded... but the resulting creature (codenamed Protoform X) was a murderous maniac who, among other things, massacred an entire space colony and ''ate'' some of his victims. After he was finally captured by Depth Charge, the Elders disposed of all the project's data (even going so far as to completely seal up Starscream's records so no one would ever try to duplicate his immortality again) and tasked Optimus Primal with dumping X on some dead world far from any civilisation. This had some unintended results: due to Primal and his crew getting drawn into the Beast Wars, Megatron was able to forcibly recruit X into his ranks. Even more unexpected was when [[OutsideContextProblem Starscream himself manifested during the conflict, and the fact that the Maximals had no idea who he was due to his records being sealed put them at a huge disadvantage]]. Luckily, former Predacon Dinobot was more familiar with Starscream thanks to the Predacons not sealing their records.
156** ''Anime/BeastWarsNeo'': It's eventually revealed that some time after [[GodOfEvil Unicron]]'s original defeat in ''WesternAnimation/TransformersTheMovie'', both Autobots and Decepticons under Optimus Prime and Galvatron respectively called a truce to move his remains to a place called the Triple Z Point. [[note]]This was presumably in response to events in the third season of ''WesternAnimation/TheTransformers'', where in "The Ghost of Starscream" it was revealed that Unicron's head (orbiting Cybertron ever since his body was destroyed during ''The Movie'') was still active and he was very much still a threat. [[/note]] The ''Legends'' manga further expands on these events: when Unicron's head was brought to the Triple Z Point where much of the wreckage of his original body had already been moved, his worshippers arrived and sacrificed themselves en masse to recreate his physical body, resulting in a desperate battle between the combined Autobot-Decepticon army and the reforming Unicron. In the aftermath, not only was Unicron's life force [[SealedEvilInASixPack spread out at random throughout the galaxy and his remains left to rot]], both sides agreed that the Triple Z Point was completely off limits out of fear that if Unicron revived once, he might do so again. It's telling that even by the time of ''Neo'' (several thousand years after the events of ''The Movie''), the Triple Z Point has been left undisturbed. [[TheDreaded That's how terrified everyone was of the possibility of Unicron reviving]].
157** ''ComicBook/TransformersTheWarWithin'': ''The Dark Ages'': Taking place during a time period when both [[BigGood Optimus Prime]] and [[BigBad Megatron]] have gone missing and the Autobot and Decepticon armies have fractured into multiple smaller factions, the mysterious and [[TheJuggernaut nigh-unstoppable]] Transformer only known as The Fallen attacks and kidnaps four Transformers (Hot Spot, Grimlock, Jetfire, and Blitzwing) as part of some sort of plot. He also recruits the Chaos Trinity, a trio of Transformers who believe in magic, to his cause by granting them actual powers. In the aftermath of the Fallen's defeat (brought about by a literal DeusExMachina as the Creator God of the Transformers briefly manifested and annihilated him with a gesture), the various factions place several locks on the seal he was trying to open to ensure no one faction would ever be able to try to finish the job.
158** Invoked in the backstory of ''Film/TransformersRevengeOfTheFallen'' during the conflict between the Dynasty of Primes and their wayward brother The Fallen. Before engaging The Fallen, [[CombatPragmatist they destroyed his servants first, then sealed up his Star Harvester using the Matrix of Leadership, and only then tried to face him directly]]. Their intent was to ensure that after they defeated him, they'd be able to safely dismantle the Star Harvester at their leisure. However, The Fallen had secretly powered himself up beforehand, and what was meant to be this trope wound up becoming a HeroicSacrifice TakingYouWithMe on the part of the Primes that left The Fallen a SealedEvilInACan.
159** ''ComicBook/Transformers2019'': Two completely separate attempts at doing this have repercussions by the time of the series' events.
160*** The first was a rampage by a being known as the Abomination, created when a group of Cybertronians happened upon the Enigma of Combination, an ancient artifact that allowed them to [[CombiningMecha combine into a gestalt entity]]. This monster rampaged across the planet, guzzling precious Energon until finally being defeated by Dai Atlas and his comrades. The resulting Energon shortage was so dire that starvation became a genuine danger, and in the aftermath, the Autobots sought to seal away the Enigma only to discover it had already vanished in the chaos.
161*** The more serious one was the War of the Threefold Spark, brought about by Exxarchon. He was a respected and well-loved figure who travelled extensively but was corrupted by entities unknown into a twisted monster with [[BodySurf the ability to take over other Cybertronians' bodies, snuffing their Sparks out in the process]] [[note]]This title of "Threefold Spark" came from how he could simultaneously exist in a maximum of three such bodies, and felt an instinctive, desperate need to always inhabit three separate bodies[[/note]]. Autobot leader Nominus Prime felt that Exxarchon had been twisted by those angry at Cybertron's aggressive expansion, which was backed by their gigantic Titans (as well as the necessity of taking over new worlds to get enough resources to keep the Titans fueled and in working order). To prevent such a devastating war from happening again, he put a halt to colonial expansion, repurposed the Titans as a defense-only fleet, had as many deadly weapons as he could find sealed up, and "encouraged" troublesome or dangerous individuals to find their way in the colonies rather than remain on Cybertron itself. By the time the series begins, while it's acknowledged that the Nominus Edict was absolutely the right call at the time, several characters warn that it no longer serves a purpose other than stifling Cybertronians as a whole, culminating in the Ascenticon political party outright launching a coup.
162[[/folder]]
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164[[folder:Music]]
165* In the Christmas song "I'm Getting Nuttin' for Christmas", a little boy realises that after [[BrattyHalfPint doing various naughty things]], he will get nothing for Christmas. He promises to be good next year so he'll get presents.
166[[/folder]]
167
168[[folder:Poetry]]
169* In the NurseryRhyme "Dr. Foster", the eponymous doctor ends up deciding never to return to the place where he stepped in a waist-deep puddle, lest it happen again.
170* "Ella [=McStumping=]" concerns a girl who jumps from a building just for kicks. When she gets severely injured and nearly dies, she decides to give up jumping entirely.
171[[/folder]]
172
173[[folder:Print Media]]
174* ''Magazine/DoctorWhoMagazine'': In "[[Recap/DoctorWhoMagazine400To402Thinktwice Thinktwice]]", the Doctor infiltrates the titular inter-galactic prison which is being run by a {{mad doctor}}, who removes the inmates' memories of who they are until they're nothing more than moaning, braindead vegetables; feeding their minds to {{eldritch abomination}}s which grow impatient and go on the rampage. At the climax, the Doctor tells one of the prison staff that he has to ensure Thinktwice is closed down and that the intergalactic authorities know what's happened so that the mad doctor can never repeat his crimes again.
175[[/folder]]
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177[[folder:Video Games]]
178* ''VideoGame/AlienIsolation'': Henry Marlow, the person who originally found the Xenomorph and accidentally brought it to Sevastopol station, becomes obsessed with destroying all trace and records of the creature by any means necessary. He tries to cause the entire station to self-destruct and take himself, Amanda Ripley, and any other survivors with him so that there could be no chance of anyone else learning about the creatures or where they come from. In his mind, the only way to prevent mankind's inevitable extinction at the hands of such monsters is to make it impossible for humanity ''ever'' come in contact with them ever again. [[DoomedByCanon Unfortunately for Marlow]], for all of his efforts [[EvilInc Weyland-Yutani]] already [[Film/{{Alien}} knows of the xenomorph]] and [[Film/{{Aliens}} will just continue to try to acquire a specimen]] in the future, with the same bloody results.
179* ''VideoGame/Doom2016'' and ''VideoGame/DoomEternal'' have [[Characters/Doom2016TheDoomSlayer the Doom Slayer]], a being [[TheDreaded quite feared]] for being a OneManArmy with a relentless hatred towards demonkind and all who ally with them. At the beginning of ''2016'', he's [[GodzillaThreshold freed from his shackles]] and returns, in a ''very'' critical time, to his previous "task" after the UAC screws quite a lot with using Argent Energy as a fuel source. The fact that he's the Doomguy from the original ''VideoGame/{{Doom}}'', ''VideoGame/DoomII'', and ''VideoGame/Doom64'' might help with this notion. At the end of the ''The Ancient Gods, Part II'' DLC for ''Eternal'', he kills Davoth, the Dark Lord and Creator of all creation, however since the Doom Slayer's lifeforce is tied to Davoth's own lifeforce, he also falls to the floor and is enclosed in the coffin again. The quote at the beginning of ''2016'' and end of ''The Ancient Gods Part II'' firmly establishes how much of a desperate measure his freeing was:
180--> '''[[VideoGame/Doom2016 Corrax Entry 7:17:]]''' ''"May your thirst for retribution never quench, may the blood on your sword never dry, and may we never need you again."''
181* This forms the bulk of ''VideoGame/FinalFantasyX'''s endgame: the characters spend the first two-thirds or so of the story trying to defeat EldritchAbomination Sin the traditional way, knowing that it's likely to [[SealedEvilInACan come back again in ten years]] like it always does. However, at that point, they learn the reason ''why'' it always comes back and switch gears into searching for a way to defeat it for good.
182* ''VideoGame/FinalFantasyXIV'':
183** This is invoked by [[spoiler:Alexander itself]] at the end of the Alexander raid series. Only one instance of a primal can be summoned at a time, preventing multiple factions from summoning the same primal. With full knowledge of this, [[spoiler:Alexander suspends itself in a single moment in time after trapping itself in a StableTimeLoop]], ensuring that Alexander can never be summoned again to threaten the world with its potential to drain the land dry of aether.
184** Nidhogg's eyes are used as a source of aether to summon the primal Shinryu, a being that threatens to bring about another Calamity with its sheer potential for destruction. After the events of ''Stormblood'', Estinien destroys eyes with his lance at the site of Shinryu's demise, ensuring that they can never be used for evil again.
185** In the later patches of ''Shadowbringers'', Merlwyb sees the opportunity to end Limsa Lominsa's ForeverWar with the Kobolds and the Sahagin when [[spoiler:Alisaie and G'raha develop a cure for tempering]]. Now able to negotiate with the leaders of both tribes, Merlwyb swears to end the feud and is willing to let patriarch Za Da shoot her if it means another peace treaty can be signed. This approach soon extends to the rest of the city-states, who offer reconciliation and peace to end the constant cycle of war and primal summoning. [[spoiler:By the end of ''Shadowbringers'', executive leaders representing each of the tribes arrive in Ala Mhigo to pledge their support for the Grand Company of Eorzea. This cements their new friendship with the city-states and marks the end of regular primal summoning in Eorzea.]]
186* In ''VideoGame/FireEmblemAwakening'', the player character gets the option to sacrifice themselves to permanently destroy Grima, instead of going through with having Chrom [[SealedEvilInACan put the creature to sleep for a thousand years.]]
187* ''VideoGame/KingdomHeartsII'': In the second visit to [[Franchise/PiratesOfTheCaribbean Port Royal]], the heroes have to help Jack Sparrow break the curse of the Aztec gold once again. After taking out the Heartless and reclaiming the treasure, they all throw the chest into the sea so no one will claim it again.
188* ''VideoGame/KingsQuestIVThePerilsOfRosella'': Princess Rosella gets captured by the minions of the evil fairy Lolotte. One item Rosella must fetch to satisfy Lolotte is Pandora's Box, hidden in a mountain tomb. Once the evil fairy is defeated, Rosella returns Pandora's Box (unopened) to the tomb. There, she locks the door with the key, then kicks that key under the door, precluding anyone from opening that door again. Smart girl.
189* ''VideoGame/MassEffect3'''s ultimate SeriesGoal is to permanently end the EternalRecurrence of the destruction of galactic civilization by the Reapers.
190* ''VideoGame/Persona4'': This is the primary motivation behind the Investigation Team's efforts to clear the final dungeon in the True Ending. With Izanami revealed as the one who set the events of the game in motion, as long as she's still around then the protagonists know that she'll just potentially do it all again unless dealt with permanently.
191* ''VisualNovel/PhoenixWrightAceAttorneyTrialsAndTribulations'': After Dahlia Hawthorne is exorcised near the end of the final trial, everyone present agrees that Dahlia must never be summoned again.
192* ''VideoGame/StarcraftII:'' Following the three main campaigns, [[BigBad Amon]] has been defeated, his CustomBuiltHost disintegrated, and his HiveMind destroyed -- but because his species, the Xel'Naga, is [[OnlyKillableAtHome Only Killable In The Void Between Universes]] he is still alive. When it becomes clear that [[ReturningBigBad Amon will return eventually]], though likely not in the main characters' lifetimes, they decide to go the extra mile and [[StormingTheCastle mount an assault on Amon within The Void]], just to make sure he is KilledOffForReal.
193-->'''Raynor:''' "We can't just kick this can down the road."
194[[/folder]]
195
196[[folder:Web Original]]
197* Quite a few {{creepypasta}}s involving lost episodes or [[TheMostDangerousVideoGame video games]] end with the protagonist destroying the disc so that no one else will have to go through the horrors they experienced.
198* ''Platform/GoAnimate'': Subverted in "[[https://www.youtube.com/watch?v=y9FO0h3X6J8 Johnny Test Abuses the CBT Gun]]". The titular character of ''WesternAnimation/JohnnyTest'' goes on a mass shooting spree with the eponymous GroinAttack gun. At the end, Susan and Mary consider destroying the gun so that nobody will abuse its power again, but then [[AbhorrentAdmirer Eugene shows up and flirts with Susan]]. Susan shoots him with it and the twins decide to keep the gun around.
199* ''Literature/IWasCursedByTheBlackEyedKids'': The [[NoNameGiven nameless protagonist]] is haunted by the titular [[BlackEyesOfEvil black-eyed creatures]], Brunette and Blondie. After Brunette [[OffWithHisHead beheads Blondie]], Brunette ends up departing into the mist. The protagonist fears that Brunette will return, so he actively tries to avoid him by collecting lucky charms and only working the daytime shift at his job.
200[[/folder]]
201
202[[folder:Web Video]]
203* ''WebVideo/CriticalRoleCampaignTwo'': Downplayed. Though it's one of many dilemmas, Trent's machinations in creating the Volstruckers horribly traumatized Caleb and he is a powerful antagonistic force against the Mighty Nein. In the end, they have him incarcerated and unable to use his magic, ensuring he may never harm any innocents ever again. Furthermore, Beau and Caleb keep an eye on the remaining member of the Cerberus Council, Ludinus, to prevent more strife. [[spoiler:Subverted as of Campaign Three, as their efforts largely fail to stop Ludinus' plans]].
204* ''WebVideo/DontHugMeImScared'': The very first episode ends with the cast being told to "get creative" by the Notebook, which spirals into a nightmarish scene of the puppet cast being replaced with people in costumes doing creepy things, while cuts to the real cast reveal them to be having seizures. At the very end, Notebook declares, "Now let's all agree, to never be creative again", seemingly having realized just how bad of an idea it was to "get creative."
205[[/folder]]
206
207[[folder:Western Animation]]
208* ''WesternAnimation/{{Bluey}}'':
209** In "Onesies", Brandy gives her two young nieces onesies. However, one of the favourite games of the youngest one, Bingo, is to pretend to be the animal she's dressed up as, leading to her running rampant pretending to be a cheetah. At one point, Chilli (Bingo's mother and Brandy's sister) decides to just ban onesies from the house.
210** In "Butterflies", the Heeler sisters and Judo play a game together that involves pretending to be caterpillars that grow into butterflies. However, Judo thinks Bingo is taking too long in the "chrysalis", so she convinces Bluey to run away from her. Later, after [[MyGodWhatHaveIDone Bluey realises she was in the wrong]], both sisters run away from ''Judo'' to teach her a lesson. When the three girls make up, Bluey says that from now on, nobody is allowed to run away.
211* ''WesternAnimation/TheCasagrandes'': Played with at the end of "Monster Cash", where Carl promises not to [[ConMan scam anybody]] again after he thinks a demon is punishing him for scamming.[[note]]It's actually his grandmother, Rosa, dressed as a demon.[[/note]] However, according to the family parrot Sergio, he's made similar promises before and always broken them, and in later episodes, he does go back to scamming.
212* ''WesternAnimation/CliffordTheBigRedDog'': In "Tummy Trouble", Clifford, Cleo, and T-Bone end up [[BalloonBelly quite bloated after they steal a bunch of dog biscuits]]. When Emily Elizabeth finds them like this, she says she'll hide the biscuit containers so that they won't overeat again.
213* ''WesternAnimation/TheFairlyOddParents'': In "[[Recap/TheFairlyOddParentsS1E13ChristmasEveryDay Christmas Every Day!]]", Timmy wishes to be able to celebrate ChristmasEveryDay so he can get more toys and spend more time with his parents. Unfortunately, as a result of his wish, snow piles up everywhere, the banks, stores, and schools remained closed, [[SantaClaus Santa]] runs out of ideas for new toys, being obligated to keep giving children what they ask for, [[ChristmasElves the elves]] go on strike due to an increased workload, and the other holiday mascots try to destroy Santa so they can celebrate their own holidays. Timmy is unable to undo the wish at first since the entire fairy population transfers most of their magic to Santa Claus so he can deliver gifts to the whole world. When the wish is finally undone thanks to Timmy convincing the children of the world to ask Santa for December 26, [[ObviousRulePatch a new rule is added to "Da Rules" to prevent any fairy godparent from granting another "I Wish it Was Christmas Every Day" wish ever again]].
214* In the ''WesternAnimation/JungleJunction'' episode "Elevan's Boing Boing Blues", Zooter annoys Elevan by making a "Boing!" noise (that she initially intended to make while making deliveries). At the end, she promises to only make the noise while making deliveries, so she won't annoy him again.
215* ''WesternAnimation/TheKoalaBrothers'': In "Alice's Night Mystery", it is revealed that [[{{Sleepwalking}} Alice has been attempting to bake in her sleep]], resulting in her kitchen being covered in flour. Frank ends up putting a lock on her cupboard (which contains the aforementioned flour) to keep her from opening it in case she does sleepwalk again.
216* ''WesternAnimation/KryptoTheSuperdog'': In the end of "Storybook Holiday", [[spoiler: Kevin tells Krypto to get rid of a page containing a spell that took them to the land of Fairy Tales after they got home. That way Krypto and Kevin will never go back to the Land of Fairy Tales again.]]
217* ''WesternAnimation/LittlePeopleEgmont'': In the 2016 series episode "Potty Ahoy", Jack spends a good chunk of it with a PottyEmergency as a result of forgetting to use the bathroom prior to an imaginary adventure. In the end, he's the one to suggest an impromptu bathroom break before the gang goes on another outing.
218* ''WesternAnimation/LittlePrincess'': In "I Want My Voice Back", the Princess [[LostVoicePlot loses her voice]] and so uses a bell to get the grownups' attention. When her voice returns, [[PlayingSick she pretends it's still gone because she likes using the bell]]. Once she's caught, she whispers to the offscreen voice that talks to her that she might still use the bell sometimes... but then we cut to Scruff the dog burying it, so she won't be able to.
219* ''WesternAnimation/TheLoudHouse'':
220** Zigzagged in "Ties That Bind" -- the Loud children [[OutOfContextEavesdropping eavesdrop on their parents, Rita and Lynn Sr., talking about getting rid of something and assume it's them when it's really Lynn Sr.'s ties]]. At the end, Lincoln vows never to eavesdrop again, but when he [[MistakenForPregnant overhears Lynn Sr. tell Rita she has "a bun in the oven" when he meant literally]], it's implied he may [[AesopAmnesia eavesdrop again anyway]]. However, the episode ends before we find out if he eavesdrops again.
221** Subverted in "Fool Me Twice" -- [[ThePrankster Luan]] promises not to prank her family again after her family claims they're moving house to prevent being pranked by her. However, it then turns out that [[AllJustAPrank her family were just pranking her back]], and in later episodes, [[SnapBack she's back to being a prankster]].
222* ''WesternAnimation/NinaNeedsToGo'': Subverted, each episode ends with Nina declaring that she won't forget to use the bathroom before it becomes [[PottyEmergency an emergency situation]] anymore, [[AesopAmnesia but the exact same thing happens again in the very next episode]].
223* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'': In "[[Recap/MyLittlePonyFriendshipIsMagicS3E3TooManyPinkiePies Too Many Pinkie Pies]]", Pinkie Pie discovers the Mirror Pool and uses it to clone herself a bunch of times so she can hang out with all her friends at once, but the clones start causing trouble around Ponyville and become impossible to tell apart from the real Pinkie Pie. After Twilight has gotten rid of all the clones and determined which Pinkie is the real one, the entrance to the Mirror Pool is sealed off with a giant boulder.
224* ''WesternAnimation/TheNewAdventuresOfWinnieThePooh'': In "[[Recap/TheNewAdventuresOfWinnieThePoohS1E6CleanlinessIsNextToImpossible Cleanliness is Next to Impossible]]", Christopher Robin and his friends had clean his room by stuffing everything under the bed which created another dimension ruled by the evil Crud. After the gang had successfully defeated the monster, they cleaned Christopher Robin's room. His mom puts a dirty sock under his bed but he puts it in the clothes hamper so Crud will never come back.
225* ''WesternAnimation/ThePenguinsOfMadagascar'': In "Truth Ache", the penguins decide to spy on their zoomates in an attempt to be CrazyPrepared. However, this plot comes crashing down when Private accidentally consumes truth serum and reveals their plans to the other animals. After Private induces LaserGuidedAmnesia on his squad and the zoomates via a spray Kowalski had invented, he subsequently destroys the spy footage to avoid another incident like it.
226* In ''WesternAnimation/PeppaPig'', "George Catches a Cold" sees him [[SickEpisode with a cold]] because he [[CatchYourDeathOfCold didn't wear his rainhat]]. When he gets better, he decides to [[ALessonLearnedTooWell wear the rainhat all the time]] so he won't catch another cold.
227* ''WesternAnimation/PreciousPup'': Subverted at the end of "Girl Whirl", where Precious and Bruiser [[LoveTriangle both fall in love with the same female dog]]. At the end, they swear not to seek romance again... only to immediately fall in love with another dog.
228* ''WesternAnimation/TheSimpsons'':
229** Parodied in the episode "[[Recap/TheSimpsonsS3E13RadioBart Radio Bart]]": the only measure the town of Springfield takes to prevent someone from falling again in the well that was the cause of all of the episode's drama is to place a teeny-tiny sign close to it that reads, "Warning: Well".
230** Parodied in the episode "[[Recap/TheSimpsonsS6E14BartsComet Bart's Comet]]", which ends with the titular comet entering Springfield's polluted atmosphere and then burning itself into a harmless rock. The townsfolk then immediately storm the observatory to destroy it [[CassandraDidIt in the belief that this will make sure this never happens again]].
231* ''WesternAnimation/WeBareBears'': In the short "Potty Time", a younger Panda gets a bad PottyEmergency and later [[PottyFailure ends up urinating on a woman when she hugs him]]. Afterwards, someone throws an empty bottle at the trio, and Grizzly suggests [[JarPotty just using that from now on]] to prevent anything like that from happening again.
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234[[folder:Real Life]]
235* At the end of a war, typically either both sides reach a peace settlement and exchange some territories and resources or one side is completely defeated and absorbed by the victor. Sometimes, the latter only happens after several wars of the former type, such that total victory over the enemy becomes an explicit means to avoid another war:
236** After three wars between the Romans and the Carthaginians, including one in which Rome itself was nearly conquered by Hannibal Barca, Rome finally ended the cycle by killing or enslaving Carthage's entire population, and later rebuilding it as a Roman city. Allegedly the Romans even [[SaltTheEarth salted the earth]] around the city, but this is apocryphal.
237** Following the French Revolution, Napoleonic France engaged in [[UsefulNotes/TheNapoleonicWars numerous wars]] with the other powers of Europe, gradually extending its control over the continent until they finally overreached by fighting a guerrilla war in Spain and losing most of their army in Russia. By 1814, the anti-French coalition was determined to occupy France itself to explicitly remove Napoleon from power and restore the Bourbons to the throne. Napoleon briefly returned to rule for another 100 days but was dethroned and exiled again.
238*** In addition, the Congress of Vienna implemented a complex series of diplomatic checks and balances that were designed to prevent another great power conflict that could cause as much death and destruction as the Napoleonic Wars did. While the great European powers were unable to prevent war entirely, they were able to prevent smaller-scale struggles from ballooning to involve more than one great power in the region that could escalate. This period of relative peace lasted for almost a full 100 years, only ending with the outbreak of UsefulNotes/WorldWarI.
239** The Treaty of Versailles that ended UsefulNotes/WorldWarI is often accused of laying the groundwork for UsefulNotes/WorldWarII by creating numerous grievances among both the victors and the vanquished while also leaving Germany in a position to rebuild their empire. The armistice also helped spread the "Stab in the Back" myth that Germany had not been defeated in the field but simply betrayed by their government.[[note]]In truth, the Germans were depleted and on the retreat on the Western front after the American entry into the war and the introduction of tanks on the Allied side. Meanwhile, the Balkan front had completely collapsed already and the Allies were pushing up to Vienna, which would have allowed them to knock Austria-Hungary out of the war and outflank Germany's western and eastern army group forces completely.[[/note]] During [=WWII=], the Allies demanded nothing less than unconditional surrender[[note]]At the insistence of President Roosevelt, who realized that the Germans needed to know that they had been defeated fully. Churchill and ''especially'' Stalin were more hesitant on this policy, since they were aware that their countries would suffer more from a longer war.[[/note]] and occupied and de-Nazified Germany so they wouldn't have to deal with a resurgent FourthReich ever again.
240* In the early 1980s, General Motors' Cadillac division tried to create an entry-level model called the Cimarron by applying Cadillac badging and styling to the J platform series of compacts. (The J platform also included the Chevrolet Cavalier, Pontiac Sunbird, Buick Skyhawk, and Oldsmobile Firenza in North America, and the Opel Ascona, Vauxhall Cavalier, and Holden Camira elsewhere.) The Cimarron was seen as a poor seller that damaged Cadillac's reputation. General Motors' product designer reportedly has a picture of it in his office with the caption "Lest we forget".
241* This is the objective of air crash investigations, as depicted in documentaries like ''Series/{{Mayday}}'': the primary objective of the investigation is to identify the cause of the crash and see what actions can be taken to prevent a reoccurrence. While issues like human error or unexpected weather are outside of manufacturer or airline control, technical flaws and oversights aren't. Examples of this include reinforcing certain parts of the airframe (e.g. to prevent doors being torn open in flight), adjusting training procedures (e.g. so an aircrew works as a team rather than a captain being a dictator), or changing rules and regulations (e.g. ion lithium batteries are no longer allowed to be transported in cargo and must be hand-carried).
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