History NiceJobBreakingItHero / AnimeAndManga

** An earlier example: when the King of Midland has Griffith jailed and tortured for deflowering his daughter Princess Charlotte, Griffith accuses ''him'' of being attracted to her, since she looks just like his dead wife. Now, if those desires did exist, they were only subconscious--the king would probably never have realized they were there. But Griffith's accusation makes him dwell on his daughter to the point of madness and in one horrible moment he [[ParentalIncest forces himself on her]]. She stops him and he regains his senses, but the damage is done. Charlotte is traumatized; the king sinks into despair and insanity; and the Band of the Hawk, now the king's only targets for revenge, are hunted for years by Midland's army and worse. Good one, Griff.

* In the Ark arc of ''Manga/DGrayMan'', WideEyedIdealist [[AllLovingHero Allen Walker]] is facing off against Tyki Mikk. During the fight, Tyki accidentally pushes him into a NextTierPowerUp and his EmpathicWeapon turns into [[spoiler:a really big sword]] that can't damage humans--only Akuma and Noah. Tyki had been relying on Allen's [[ThouShaltNotKill reluctance to kill another human]], so he was a bit surprised when Allen [[spoiler:stabbed him right through the chest in an attempt to remove the Noah from him]]. It seems to have worked for a while, but then it turns out that [[spoiler:all Allen managed was to wake it up and Tyki goes BodyHorror OneWingedAngel]]. [[OhCrap Woops]].

* ''Literature/FromTheNewWorld'': Good job Education Board. By trying to kill [[ShrinkingViolet Mamoru]] [[AdultFear in fear of him becoming a threat]], you prompted him to run away which later leads to [[BetaCouple Maria]] joining him when she and the others try to bring him home, which leads to Saki and Satoru having to make a deal with [[TheStarScream Squeler]] to fake their deaths so they won't be hunted down by you and the other villages, which later allowed him to [[KilledOffForReal actually kill them]] so he could raise their child into a TykeBomb [[NoHoldsBarredBeatDown to kill all of you ten years later]]--[[SelfFulfillingProphecy congratulations!]]

* ''Manga/MagicalCircleGuruGuru'' has the characters discover Kukuri's birthplace where items for her use had been left behind. The bad news is the items had been collected by monsters called Kem Kems. Good news is they're tame and don't object to people taking back what's theirs. Unfortunately, they also don't object to people taking items and ''selling'' them, which is exactly what Nike, Kukuri, and Toma did prior to reaching the ruins. To make it worse, a necklace meant specifically for Kukuri was lost when Toma earlier used the item it was kept in as an impromptu rocket launcher. In the ''Doki Doki Densetsu'' version of the anime, Poor Kukuri simply snaps at this point and mentally regresses to a four-year old for a few moments. For the record, they ''did'' find the necklace soon after. In Old Man North-North's grass skirt.

* When Elma and Tohru first met in ''Manga/MissKobayashisDragonMaid'', Elma was attempting to bring about peace among the humans in the other world. It resulted in a cult that was prepared to go to war with anyone who wouldn't worship her--[[ThroughHerStomach getting Elma to look the other way by bribing her with food]]. Tohru's outrage at Elma's hypocrisy [[WeUsedToBeFriends led to them having a falling out]] and becoming rivals.

** Celestial Being had an unintentional variant of this. Their plan in Season One involved getting the whole world to quit shooting each other, and unite them towards a common enemy (them). Unfortunately, this works far too well [[spoiler: as this results in the creation of the A-LAWS. But in a subversion, it seems that this too was part of Aeolia's plan. Not bad for a guy who'd been in cryogenic stasis for over a century before the conflict even started]].

** Itachi's entire plan for Sasuke is a NiceJobBreakingItHero. It never occurred to him that [[MindRape mind-raping]] him twice would be detrimental to Sasuke's mental health. Nor occurring to him that beating him half to death twice would make him psychotic. Nor occurring to him that Sasuke might kill Naruto to get the MS. Nor tried to stop Orochimaru from getting Sasuke. If he didn't intervene or interfere with Sasuke's life at all, he would have gotten what he wanted-a Konoha Aligned Sasuke killing him instead of a fucked up mentally Neutral Sasuke.

*** Despite her good intentions in the Five Kage Summit arc, due to letting her emotions getting the better of her and underestimating Sasuke and the affair concerning him, the only things Sakura managed to do is nearly get herself, Kakashi and Naruto killed--with Naruto from both facing Sasuke and being cut by ''her own poisoned kunai'' that Sasuke tried to used on her when the former saved her.

** In order to prevent Mytho from destroying his own emotion of love, Fakir cuts the mythical sword capable of doing so in half. It also ensured that his heart could not be shattered again. Now how could this possibly be a bad thing? [[spoiler: The piece of Mytho's heart that held love was recently bathed in raven's blood, thus corrupting it--and now it's corrupting Mytho. The only way to get the thing out? Shattering his heart by using the very sword that Fakir destroyed.]] Whoopsie.

** Hell, had the Sybil system never been invented--[[StartOfDarkness half the latent criminals in the series wouldn't have even become criminals in the first place.]]

** And Rossiu, in an attempt to figure out how close "something worse" is to happening, [[spoiler:evacuates humans from their underground cities even when they don't want to leave--not-quite-unwittingly bringing disaster closer with every person living on the surface]].

*** The hero wasn't immune to this either. When Judai was little, he had a card named [[StalkerWithACrush Yubel]] that was very protective of him. Whoever Judai dueled or was close to, Yubel would cause harm to them and made them fall into a coma. By Judai's request, Yubel was sent into outer space by Kaibacorp hoping [[AmbiguousGender they]] would absorb "the powers of justice" like his Elemental Hero Neos would. But instead they absorb powers the [[EldritchAbomination Light of Destruction]] and was driven insane. After landing back on Earth, they became Season Three's BigBad and orchestrated the events that happen to Judai and his friends.

* All over the place in ''LightNovel/TheRisingOfTheShieldHero''. Due to the fact that the Sword, Spear and Bow Heroes treat the world like a videogame, they end up causing more harm than good, and Naofumi is forced to pick up the slack and fix their messes. In order: Ren slays a dragon and forgets to dispose of the corpse, causing it to pollute the air of a nearby village (and later it resurrects as a [[DracoLich zombie]] for good measure); Motoyasu gives a starving village a magical seed, not bothering to read the runes warning that it's a cursed seed and was sealed because it only creates monster plants; and then Itsuki aids the rebel forces of a small kingdom to slay their king because he was heavily taxing his populace, only for the rebels to [[HereWeGoAgain heavily tax the populace again]] because they need the money to protect them from the waves. And this is all before [[spoiler: the infamous [[LeeroyJenkins Spirit Tortoise incident...]]]] [[spoiler: that '''[[LeeroyJenkins they started in the first place]]''', thinking it was just a generic [[BonusBoss extra boss]] that they could take down with ease with their supposed [[DidntThinkThisThrough preparation]].]]

* All over the place in ''LightNovel/TheRisingOfTheShieldHero''. Due to the fact that the Sword, Spear and Bow Heroes treat the world like a videogame, they end up causing more harm than good, and Naofumi is forced to pick up the slack and fix their messes. In order: Ren slays a dragon and forgets to dispose of the corpse, causing it to pollute the air of a nearby village (and later it resurrects as a [[DracoLich zombie]] for good measure); Motoyasu gives a starving village a magical seed, not bothering to read the runes warning that it's a cursed seed and was sealed because it only creates monster plants; and then Itsuki aids the rebel forces of a small kingdom to slay their king because he was heavily taxing his populace, only for the rebels to [[HereWeGoAgain heavily tax the populace again]] because they need the money to protect them from the waves. And this is all before [[spoiler: the infamous Spirit Tortoise incident...]] [[spoiler: that '''[[LeeroyJenkins they started in the first place]]''', thinking it was just a generic [[BonusBoss extra boss]] that they could take down with ease with their supposed [[DidntThinkThisThrough preparation]].]]

*** In the Season 2 finale, Kenzan tries to stop a brainwashed minion from firing the Ea*rthShatteringKaboom by smashing the laptop computer that controls the satellite cannon. As soon as he does this, he learns the missile was just fired and he's just destroyed the only means of stopping it!

* ''Manga/RosarioToVampire [=Capu2=]'': Kurumu and Mizore both make the decision to lie to their respective mothers about their relationship with Tsukune; as a result, Ageha and Tsurara seize their daughters' love lives as an opportunity to continue their old rivalry, with the two destroying a good portion of Yokai Academy in a fight with one another and then directly interfering with Tsukune's attempts to get to Moka's father and retrieve Moka's rosary in the finale.

* ''LightNovel/ACertainMagicalIndex'': In episode one, Touma destroys Index's magical MadeOfIndestructium cloak to prove he has AntiMagic. This leaves her defenseless and she becomes grievously wounded later.
** Much later, during the Sisters arc, Touma [[spoiler:fights Accelerator, which turns out to be the boost he needed to reach Level 6]]. Thankfully subverted when Touma managed to fix the problem [[spoiler:by knocking out Accelerator before he manages the shift]].

* ''Manga/ACertainScientificRailgun'': Misaka finishes off the overpowered [[spoiler:Kiyama-sensei]], bringing an end to the Level-Upper arc, except now the [[spoiler:entire network suddenly becomes unstable without her to control it and it's just given birth to a weird . . . fetus . . . thing]] that's heading for a ''nuclear reactor'']]. And the only person who knows what's going on is out for the count.
* ''Anime/CodeGeass'': In the first season, facing obliteration, Lelouch/Zero geasses Suzaku to "Live!" One year later [[spoiler:Lelouch orders his best pilot Kallen in her new Super Robot to ''kill'' Suzaku, which results in the Geass activating, forcing Suzaku to turn to his only remaining weapon: an anti-matter nuke. Nice job nuking Tokyo, anti-hero]].

* In ''Manga/SevenSeeds'', Hana, Fujiko, and Chisa explore a cave that turns out to be a preserved ruin from [[AfterTheEnd before the meteorites fell on Earth]]. While exploring, they open a tightly closed door, they feel a slight breeze and find a mushroom farm. Hours later, the location they are staying in, the plants and even animals are sprouting mushrooms everywhere. They unwittingly released shiitake spores, overall a harmless thing, but since the eco-system and location hasn't dealt with anything even remotely close to this mushroom before, they caused the entire location to become dangerous for anyone, animal or human, to live in. [[spoiler:The fact that the location gets burned down by a forest fire is seen as a quick way for nature to balance itself out again.]]

* ''Anime/YuGiOhTheDarkSideOfDimensions'' starts when an excavation team finds the pieces of the Millennium Puzzle, as well as the Tablet of Memories, in the burial chamber. Also, most of the problems in the movie can be directly traced back to Kaiba and Shadi.
* In the Season 2 finale of ''Anime/YuGiOhGX'', Kenzan tries to stop a brainwashed minion from firing the EarthShatteringKaboom by smashing the laptop computer that controls the satellite cannon. As soon as he does this, he learns the missile was just fired and he's just destroyed the only means of stopping it!
** The hero wasn't immune to this either. When Judai was little, he had a card named [[StalkerWithACrush Yubel]] that was very protective of him. Whoever Judai dueled or was close to, Yubel would cause harm to them and made them fall into a coma. By Judai's request, Yubel was sent into outer space by Kaibacorp hoping [[AmbiguousGender they]] would absorb "the powers of justice" like his Elemental Hero Neos would. But instead they absorb powers the [[EldritchAbomination Light of Destruction]] and was driven insane. After landing back on Earth, they became Season Three's BigBad and orchestrated the events that happen to Judai and his friends.
* ''Anime/YuGiOh5Ds'': The five Signers think they've successfully stopped the season's BigBad and saved the world by defeating him in a duel, only to shortly realize they've brought his EvilPlan to fruition, as, [[XanatosGambit regardless of their victory, the duel completed "the Circuit"]], allowing the Arc Cradle to descend over New Domino and begin the countdown to the city's destruction.
** Jack is indirectly responsible for Carly [[spoiler:dying and coming back wrong]]; while he left her to [[ItsNotYouItsMyEnemies protect her from the Dark Signers]], he failed to explain that and was so brusque about it she decided to investigate them to prove she was useful. This led to [[spoiler:Divine killing her]] and her subsequent [[spoiler:resurrection as a Dark Signer who Jack had to kill]].
* ''Manga/YuYuHakusho'': In the Chapter Black saga, Yusuke allowed [[BigBad Shinobu Sensui]] to fully power up so they could have a good battle. This ended up getting him killed. Dangit, Yusuke, you made Kuwabara cry again!

*** [[spoiler:Retconned into Exaggerated territory by 3.0. Shinji actually started Third Impact. Which trapped him in Unit 01 on the moon for 14 years, killing off the majority of the population the Second Impact didn't and being universally hated by everyone who survived. And the kicker, Rei II is now stuck in the core of Unit 01.]]

* While they can't be fully considered "heroes", the Marines in ''Manga/OnePiece'' cause this following [[spoiler: The Whitebeard War. Their long, elaborate plan to kill Whitebeard worked and they also killed off the son of the Pirate King (Ace). The only problem is that in doing so, they horribly screwed up the power balance of the New World, causing several towns to get overrun by pirates. Also, since Whitebeard confirmed that One Piece existed with his dying breath, the piracy rates have practically DOUBLED. To make matters worse, Blackbeard managed to free some of the worse criminals in the history of the world, added them to his crew, and has now stolen Whitebeard's Devil Fruit, which is capable of causing untold carnage, before finally declaring war on the World Government. And to top it all off, the Elders decided to censor the escape of even more of the Level 6 prisoners, meaning they can do whatever the hell they want. So basically, they wound up screwing up the Entire World thanks to a horribly short sighted plan. Then the cover-up of the Level 6 prisoners' escape causes Fleet Admiral Sengoku to resign in disgust, leaving a secession crisis for who will lead the Marines. To settle this, a duel is held between Admirals [[GeneralRipper Akainu]] and [[ReasonableAuthorityFigure Aokiji]]. Akainu wins and Aokiji leaves the Marines. Thus, two of their four most powerful members are gone]].

* In ''VisualNovel/ShoujotachiWaKouyaOMezasu'', the Typhoon game company CEO challenges the Rokuhara club to a contest to see who can sell more games on their launch date after being splashed in the face with a glass of water due to her aggressive recruiting attempts of various club members.

* ''Manga/AkagamiNoShirayukihime'': Tariga started having a melt down after he realized that Touka had arrived but Tsuruba hadn't been seen as [[spoiler:it meant Tsuruba was likely dead]]. Unfortunately he reacted to this revelation by using a KnockoutGas on [[spoiler:Touka's]] guards in order to confront him and the heartless noble's BreakingSpeech worked wonders, with Tariga nearly stumbling from the room while leaving it unguarded, unlocked, and with the unconscious guards' weapons now handy for the villain.

* ''Webcomic/AxisPowersHetalia'': In the ''Running Away With Mr. Swe'' strip, [[NiceGuy Finland]] decides to follow [[GentleGiant Sweden]], who's fed up with Denmark's attitude and being controlled, and run away to live on their own. While he's at first glad that he's gotten away from Denmark, it doesn't take long for Finland to start mentally kicking himself for his spontaneous decision, considering the person that he ran away with has a FaceOfAThug and IcyBlueEyes. He's so terrified of Sweden that he decides he can't live with him and makes plans to run away in the middle of the night while Sweden is asleep, only to have his [[ThwartedEscape escape attempt thwarted]] by an unknowing Sweden himself.

* ''Anime/{{Doraemon}}'' should have a lot of examples throughout the show's run. It at least happened in the movie, "[[Anime/DoraemonNobitaInTheWanNyanSpacetimeOdyssey Nobita in the Wan-Nyan Spacetime Odyssey]]". Nobita finds stray dogs and cats and wants them to have a home. The gang time travels them back 300 million years and providing them with evolution and a food-making machine. When they visit them again, they encounter a time disturbance causing them to be stranded in a different year in that era with advanced sentient dogs and cats, thus starting the movie.

* ''Manga/KamikazeKaitouJeanne'': In a way similar to the ''Magic Knight Rayearth'' example, [[spoiler:the ''entire first half'']] was this. [[spoiler:Maron/Jeanne is helping out God by sealing demons to keep Satan at bay and her boyfriend/arch enemy Chiaki/Sinbad is an agent of the devil, right? Bzzt, wrong! It's revealed that Maron's angel sidekick Finn Fish is actually working for the devil and had been lying to Maron the whole time. ''She'' was helping the devil and Chiaki God, not the other way around. So Maron had actually been the one working for the devil the whole time, making him stronger than ever.]]

* ''Manga/MagicKnightRayearth''. Save the princess, kill her kidnapper, SaveBothWorlds, right? Uh [[spoiler:nope. She was never kidnapped in the first place; he was trying to kill the Magic Knights because they're supposed to be the princess' ''executioner''. Said princess literally cannot focus on her own happiness and fulfillment without dooming the world, so she summoned them to kill her. This leaves the girls with massive psychological trauma and Cephiro without a Pillar, leaving it desolate and exposed to invasion in Part II]].

* In ''Manga/MahouSenseiNegima'', all of Ala Alba went to the Magical World, including the [[spoiler:unbeknownst-to-them-Princess Asuna]]. Asuna is then kidnapped by Fate and the Cosmo Entelecheia remnant who do something very ominous relating to her AntiMagic powers. [[WildMassGuessing The going theory]] is that by bringing the princess to where the bad guys can get her, ''they directly caused the revival of the BigBad''.

*** First, he was of the opinion that the Uchiha would eventually betray Konoha. Well, he certainly laid the groundwork to [[{{SelfFulfillingProphecy}} making sure they would.]] Between Tobirama's paranoia about the Uchiha, and Madara's even ''more'' paranoid reactions to Tobirama, a betrayal became inevitable.

** This trope could also be attributed to Ohgi and his culpability in [[spoiler:convincing the Black Knights to follow his lead in betraying Lelouch due to his gullibility regarding the claims of Schneizel and Villetta, which results in isolating Lelouch once and for all and him ultimately going down the path of the Zero Requiem, which is largely an excuse for him to die as he has lost all hope and him causing more destruction than he otherwise would have for a peace that logically won't last very long, as it is built on a flimsy pretext. That the ending is as happy as it is, given the circumstances (Lelouch doing worse things than anyone in history), is pure No Endor Holocaust at its finest]].
* In the Ark arc of ''Manga/DGrayMan'', WideEyedIdealist [[AllLovingHero Allen Walker]] is facing off against Tyki Mikk. During the fight, Tyki accidentally pushes him into a NextTierPowerUp and his EmpathicWeapon turns into [[spoiler:a really big sword]] that can't damage humans--only Akuma and Noah. Tyki had been relying on Allen's [[ThouShaltNotKill reluctance to kill another human]], so he was a bit surprised when Allen [[spoiler:stabbed him right through the chest in an attempt to remove the Noah from him]]. It seems to have worked for a while, but then it turns out that [[spoiler:all Allen managed was to wake it up and Tyki goes Body Horror One Winged Angel]]. [[OhCrap Woops]].

* In ''Anime/GundamBuildDivers'', our heroes are in a conundrum: [[DiscOneBoss Tsukasa Shiba]] is poised to destroy the Gunpla Battle Nexus Online game through his ultimate Break Decal mounted on a [[Anime/MobileSuitGundam Big Zam]], making him invincible as it modified the Gunpla's armor to be stupidly strong. As everyone's trying to figure out what to do, [[MysteriousWaif Sarah]] declares her desire to protect their game world, somehow causing [[TheHero Riku's]] Gundam 00 Diver Ace to sprout energy wings that helped eradicate that device and allow everyone to save the day. All's well that ends well, right? Nope! [[spoiler:As it turns out, Riku and his friends later find out that Sarah is actually an AI accidentally created by the game, that the wings were the manifestation of her powers awakening and that her essence was accidentally spread all across the servers, threatening to destroy the game ''again''.]]

* The backstory to ''Anime/HeartcatchPrettyCure'' is this: Yuri and her fairy partner, Cologne, realize that the Desertians are getting stronger. With two new fairies, Chypre and Coffret, around, Cologne urges Yuri to use them to find help, but she declines, not wanting to burden others with the job and instead decides to try to obtain the Heartcatch Mirage. [[spoiler:When she does so, the Dark Precure is waiting for her at the Precure Palace and Yuri tussles with her, leading to Cologne's death, her de-powering and shouldering the responsibilities of saving the world to an Innocent Flower Girl and her Genki Girl best friend with no brain-to-mouth filter.]]

*** It gets worse. In the climax of 3.0 itself, [[spoiler:Shinji, aided by Kaworu, eventually sets out to obtain the spears of Longinus and Cassius to somehow Set Right What Once Went Wrong back in 2.0. But as it turns out, they have been fooled big time and what's waiting for them are two identical spears that will only finish the destruction of humanity by triggering Fourth Impact. Kaworu notices that something's off, but that gets lost in the confusion of the ensuing battle, after which Shinji pulls the spears out. Cue ''epic'' My God What Have I Done moment. The icing on the cake? Kaworu, the last person to treat Shinji like a human being, decides to pull a Heroic Sacrifice to end the impending apocalypse, dying violently right before Shinji's eyes. The kicker: it doesn't help. ''Mari'' ends Fourth Impact by yanking Shinji out of his mecha. That poor kid just can't catch a break]].

* All over the place in ''LightNovel/TheRisingOfTheShieldHero''. Due to the fact that the Sword, Spear and Bow Heroes treat the world like a videogame, they end up causing more harm than good, and Naofumi is forced to pick up the slack and fix their messes. In order: Ren slays a dragon and forgets to dispose of the corpse, causing it to pollute the air of a nearby village (and later it resurrects as a [[DracoLich zombie]] for good measure); Motoyasu gives a starving village a magical seed, not bothering to read the runes warning that it's a cursed seed and was sealed because it only creates monster plants; and then Itsuki aids the rebel forces of a small kingdom to slay their king because he was heavily taxing his populace, only for the rebels to [[HereWeGoAgain heavily tax the populace again]] because they need the money to protect them from the waves. And this is all before [[spoiler: the infamous Spirit Tortoise incident...]] [[spoiler: that '''[[LeeroyJenkins they started in the first place]], thinking it was just a generic [[BonusBoss extra boss]] that they'd take down with ease.]]

* All over the place in ''LightNovel/TheRisingOfTheShieldHero''. Due to the fact that the Sword, Spear and Bow Heroes treat the world like a videogame, they end up causing more harm than good, and Naofumi is forced to pick up the slack and fix their messes. In order: Ren slays a dragon and forgets to dispose of the corpse, causing it to pollute the air of a nearby village (and later it resurrects as a [[DracoLich zombie]] for good measure); Motoyasu gives a starving village a magical seed, not bothering to read the runes warning that it's a cursed seed and was sealed because it only creates monster plants; and then Itsuki aids the rebel forces of a small kingdom to slay their king because he was heavily taxing his populace, only for the rebels to [[HereWeGoAgain heavily tax the populace again]] because they need the money to protect them from the waves. And this is all before [[spoiler: the Spirit Tortoise incident.]]

* All over the place in ''LightNovel/TheRisingOfTheShieldHero''. Due to the fact that the Sword, Spear and Bow Heroes treat the world like a videogame, they end up causing more harm than good, and Naofumi is forced to pick up the slack and fix their messes. In order: Ren slays a dragon and forgets to dispose of the corpse, causing it to pollute the air of a nearby village (and later it resurrects as a [[DracoLich zombie]] for good measure); Motoyasu gives a starving village a magical seed, not bothering to read the runes warning that it's cursed and was sealed because it only creates monster plants; and then Itsuki aids the rebel forces of a small kingdom to slay their king because he was heavily taxing his populace, only for the rebels to [[HereWeGoAgain heavily tax the populace again]] because they need the money to protect them from the waves. And this is all before [[spoiler: the Spirit Tortoise incident.]]

* All over the place in ''LightNovel/TheRisingOfTheShieldHero''. Due to the fact that the Sword, Spear and Bow Heroes treat the world like a videogame, they end up causing more harm than good, and Naofumi is forced to pick up the slack and fix their messes. In order: Ren slays a dragon and forgets to dispose of the corpse, causing it to pollute a nearby village (and later it resurrects as a [[DracoLich zombie]] for good measure); Motoyasu gives a starving village a magical seed, not bothering to read the runes warning that it's cursed and was sealed because it only creates monster plants; and then Itsuki aids the rebel forces of a small kingdom to slay their king because he was heavily taxing his populace, only for the rebels to [[HereWeGoAgain heavily tax the populace again]] because they need the money to protect them from the waves. And this is all before [[spoiler: the Spirit Tortoise incident.]]

*** [[spoiler: Also after Shirley's, Lelouch has the Geass Order exterminated, while it does damper V.V.'s plans, it actually causes the Black Knights to distrust him further. If he really wanted to eliminate the Geass threat, he should destroyed that one island that was implied to one of several special sites to active the Ragnarok/Assimilation plan, which would have really fucked up V.V. and Charles' plans completely.]]

* ''Anime/SailorMoon'': The entire Black Moon Clan arc is one humongous set of this trope, particularly starting with the first half. The entire thing kicks off when Chibiusa accidentally absorbs the future Silver Crystal, leading to Crystal Tokyo to come under attack. This forces Chibiusa to go back into the past to find the past Silver Crystal as she thinks the future one is lost forever. At the same time, King Endymion decides to put his past self, Mamoru, through a SecretTestOfCharacter by giving him strange prophetic dreams of some disaster happening involving him and Usagi, hoping that he can solve it and the two can handle anything together. Instead, Mamoru bombs it big time as he decides the best thing to do is to ''dump Usagi and not say why''. Needless to say, Mamoru's pissed when the king tells him what went on. And finally, when Chibiusa discovers Usagi is Sailor Moon and that she has the Silver Crystal, she's so indignant that she has the item that she declares her unworthy and steals the crystal (along with the brooch), allowing Rubeus to strike and kidnap the Inners while Usagi is powerless. Unsurprising, given the general quality of the anime's writing; the break-up mini arc was a full-blown IdiotPlot. Averted in [[Manga/SailorMoon the manga]] and ''[[Anime/SailorMoonCrystal Crystal]]'', where ''none'' of this happens. [[{{Filler}} It was completely made up for the anime]].

* NiceJobBreakingItHero/DragonBall

* It's become a RunningGag on the ''Anime/GuiltyCrown'' page to begin every entry under NiceJobBreakingItHero as "Good job, character!" and to follow with an explanation on the plan and how it wound up backfiring.
* ''Manga/RosarioToVampire [=Capu2=]'': Kurumu and Mizore both make the decision to lie to their respective mothers about their relationship with Tsukune; as a result, Ageha and Tsurara seize their daughters' love lives as an opportunity to continue their old rivalry, with the two destroying a good portion of Yokai Academy in a fight with one another and then directly interfering with Tsukune's attempts to get to Moka's father and retrieve Moka's rosary in the finale.
* Kaito from ''VisualNovel/RoboticsNotes'', [[UnwittingPawn by collecting all the Koujima Kou research files]], allowed the [[ManBehindTheMan true villian]] to kick off his ThanatosGambit.
* In ''Manga/SevenSeeds'', Hana, Fujiko and Chisa explore a cave that turns out to be a preserved ruin from [[AfterTheEnd before the meteorites fell on Earth]]. While exploring, they open a tightly closed door, they feel a slight breeze and find a mushroom farm. Hours later, the location they are staying in, the plants and even animals are sprouting mushrooms everywhere. They unwittingly released shiitake spores, overall a harmless thing, but since the eco-system and location hasn't dealt with anything even remotely close to this mushroom before, they caused the entire location to become dangerous for anyone, animal or human, to live in. [[spoiler: The fact that the location gets burned down by a forest fire is seen as a quick way for nature to balance itself out again.]]
* Had the [[Anime/PsychoPass Sybil system]], after capturing [[spoiler:Makishima Shougou]], restrained him when they tried to [[spoiler:[[WeCanRuleTogether convince him to become part of the system]]]] All the crap everyone had to go through in the second season might have been avoided.
** Hell, had the Sybil system never been invented - [[StartOfDarkness half the latent criminals in the series wouldn't have even become criminals in the first place.]]
* Good job [[Literature/FromTheNewWorld Education Board]], by trying to kill [[ShrinkingViolet Mamoru]] [[AdultFear in fear of him becoming a threat]], you prompted him to run away, which later leads to [[BetaCouple Maria]] joining him when she and the other try to bring him home, which lead to Saki and Satoru having to make a deal with [[TheStarScream Squeler]] to fake their deaths so they won't be hunted down by you and the other villages, which later allowed him to [[KilledOffForReal actually kill them]] so he could raise their child into a TykeBomb [[NoHoldsBarredBeatDown to kill all of you ten years later]] - [[SelfFulfillingProphecy Congratulations!]]
** Though to be fair, [[UnwittingInstigatorOfDoom Saki]] should have probably stopped them from running away by directly bringing Mamoru back home when they found him in the first place
* ''Anime/MobileSuitGundam00'' gives us a Nice Job Breaking It ''Villain''. Near the end of Season 1, the BigBad's assassination of [[spoiler:the hibernating Aeolia Schenberg]] triggers a DeadMansSwitch which [[spoiler:unlocks the Gundams' SuperMode.]] With this advantage, the good guys have a fighting chance in what had previously been an all but impossible battle. Thus, in the first season finale, [[spoiler: They manage to kill the BigBad and fight the remainder of his forces to a bloody stalemate.]]
** Celestial Being had an unintentional variant of this. Their plan in Season One involved getting the whole world to quit shooting each other, and unite them towards a common enemy (them). Unfortunately, this works far too well [[spoiler: as this results in the creation of the A-LAWS. But in a subversion, it seems that [[TheChessmaster this too was part of Aeolia's plan]]. Not bad for a guy who'd been in cryogenic stasis for over a century before the conflict even started]].
* In ''Anime/MobileSuitGundamWing'' [[TheHero the five Gundam pilots]] are planning to killing United Earth Sphere Alliance leaders to stop their oppresion of the space colonies. [[spoiler:Problem is, they actually ''started peace talks'' when the pilots do the plan. Result: peace-seeking leaders killed, [[ProudWarriorRaceGuy OZ]] and [[WarForFunAndProfit Romefeller Foundation]] are free from hindrance and take over the Earth, and the pilots get serious cases of HeroicBSOD]]
** Since Heero was the one who actually pulled the trigger to kill all the UESA leaders, you could say "[[IncrediblyLamePun Nice Job Breaking It, Heero]]."
* In the original ''Anime/MobileSuitGundam'', part of the events from before the show starts involves TheFederation diverting a ColonyDrop from hitting their incredibly well armored fortress in the middle of the mostly uninhabited Amazon rain forest. The problem is, a piece of it hit the very much inhabited Sydney. Oops.
** To be fair, the chances of it hitting not only a continent, but a major city at that, rather than splashing down in the ocean, are probably pretty slim. And splashing down in the ocean could've caused a tsunami that could've been even worse for far more people.
* In ''Anime/MobileSuitGundamSEEDDestiny'', one might say this trope occurs throughout the series with the Freedom and Archangel interfering with the war. But at the Second Battle of Onogoro, [[spoiler: Kira preventing Shinn from continuing his attack on Orb allowed Djibril to escape, thus letting him fire Requiem and destroy a lot of the [=PLANTs=]. Shinn in SEED mode most likely would have stopped Djibril before getting on the shuttle or soon after he launched. Kira and the Archangel would have lost Orb, but considering the only Orb forces they had at the final battle were the ones they had before Onogoro...]]
** One could argue that Athrun's attempts to [[CorporalPunishment discipline Shinn by slapping him]] only made Shinn ''more'' resentful of him, thus pushing him towards his eventual psychosis. Particularly when he disciplined Shinn for doing things ''he was supposed to do'', like shooting down Kira who was clearly an enemy of ZAFT at the time.
* In ''Anime/TengenToppaGurrenLagann'', the first part of the story is about the struggle for humans to return to the surface by killing the evil overlord keeping them underground... [[spoiler: Sadly, the evil overlord was protecting the humans from something worse.]] Ooops.
** Turns out that the "Something worse" is [[spoiler: actually oppressing and destroying sentient races across the universe because if they become too advanced, they could cause ''existence itself'' to collapse.]]
** Some have theorized the opening takes this even farther, [[spoiler:and actually shows an alternate ending right before existence ''does'' end.]]
** And Rossiu, in an attempt to figure out how close "something worse" is to happening, [[spoiler: evacuates humans from their underground cities even when they don't want to leave -- not-quite-unwittingly bringing disaster closer with every person living on the surface.]]
* ''Anime/BloodPlus''. By freeing Diva, who had been tortured and experimented on until that point and transformed into a PsychopathicManchild by the [[MadScientist scientists]] who found them, from her confinement in the tower, Saya set loose the BigBad who would go on to slaughter humanity [[ForTheEvulz for the hell of it]] for the next hundred-plus years. The ''entire series'' revolves around Saya and her pals trying to hunt down and kill Diva to correct Saya's mistake.
* ''Manga/MagicKnightRayearth''. Save the princess, kill her kidnapper, SaveBothWorlds, right? Uh... [[spoiler:nope. She was never kidnapped in the first place; he was trying to kill the Magic Knights because they're supposed to be the princess' ''executioner''. Said princess literally cannot focus on her own happiness and fulfillment without dooming the world, so she summoned them to kill her. This leaves the girls with massive psychological trauma and Cephiro without a Pillar, leaving it desolate and exposed to invasion in Part II]].
* Occurs on a spectacular scale in ''Anime/NeonGenesisEvangelion''. While Gendo and SEELE propagate the general purpose and technically true cover story that their mission is to prevent the Angels from initiating Third Impact (which would kill the entire human race), the reason for killing the Angels is in actuality so that they don't interfere in the Human Instrumentality Project, which is a fancy name for SEELE-controlled Third Impact.
** [[spoiler:While Gendo has been preparing his own Instrumentality plan for years under the noses of his superiors, one that is arguably a little better than "genocide and hope for the best," Shinji accidentally triggers their original plan at the eleventh hour. Things get better. I guess.]]
** Played straight in ''Anime/RebuildOfEvangelion 2.0'': Oh Shinji, in the short span of 90 minutes you've managed to make yourself likeable again, have reached out to other people, grown a bit of a spine, and even got to kick a gargantuan amount of ass... Too bad saving the girl results in [[spoiler: Third Impact, trapping you and her in your "GiantRobot" while your bishounen counterpart descends from the moon to lance you in the chest!]]
*** [[spoiler: The lancing actually stops Instrumentality dead in its tracks.. After all, [[TemptingFate they couldn't stretch the final battle over 2 films.]]]]
*** [[spoiler: Retconned into Exaggerated territory by 3.0. Shinji actually started Third Impact. Which trapped him in Unit 01 on the moon for 14 years, killing off the majority of the population the Second Impact didn't and being universally hated by everyone who survived. And the kicker, Rei II is now stuck in the core of Unit 01.]]
*** It gets worse. In the climax of 3.0 itself, [[spoiler: Shinji, aided by Kaworu, eventually sets out to obtain the [[MacGuffin spears of Longinus and Cassius]] to somehow SetRightWhatOnceWentWrong back in 2.0. But as it turns out, they [[UnwittingPawn have been fooled big time]], and what's waiting for them are to identical spears that will only finish the destruction of humanity by triggering Fourth Impact. Kaworu notices that something's off, but that gets lost in the confusion of the ensuing battle, after which Shinji pulls the spears out... Cue ''epic'' MyGodWhatHaveIDone moment. The icing on the cake? Kaworu, the last person to treat Shinji like a human being, decides to pull a HeroicSacrifice to end the impending apocalypse, dying [[YourHeadASplode violently]] right before Shinji's eyes. The kicker: [[SenselessSacrifice It doesn't help.]] ''Mari'' ends Fourth Impact by yanking Shinji out of his mecha. That poor kid [[CosmicPlaything just can't get a break.]] ]]
* ''Manga/PokemonAdventures'':
** One of the first things Yellow does is breaking up an attempt by an apparently resurfacing Team Rocket to hijack the ship S.S. Anne. [[spoiler:Said hijacking was part of a plan by [[HeelFaceTurn a reformed]] Lt. Surge to lure out the Elite Four with a rumor about finding the one they were looking for]].
** During the Platinum arc, Buck figures that he has to protect the Magma Stone from Team Galactic, so he moves it, intending to bring it home with him. This action in fact awakens the legendary Pokemon Heatran, Team Galactic's true target, and Buck has unwittingly brought them right to it.
** In the BW arc, the Dark Stone is in Lenora's impenetrable office and the only key is smashed. However, Black knows how to get in thanks to his Gym battle against her. [[spoiler: A Plasma Grunt, disguised as Brycen, tricks Black into opening it for him and knocks the kid out before stealing the Stone.]]
* Frequently implied to occur whenever the ''LightNovel/DirtyPair'' are on the job (it's the reason for their EmbarrassingNickname), but one OVA episode spells it out plainly. The Angels are investigating the mysterious deaths of several hundred mining employees on a planet run as a religious colony; they find that the religion's leadership has evolved into a murdering cult that, with the help of a ring of weather satellites, is capable of calling down Sodom-and-Gomorrah-style devastation down in a specific location. After they destroy the cult's station in orbit, they assume correctly that the cult's reign of terror is ended. Unfortunately, the space station was also the control for the weather satellites, and the weather satellites ''weren't'' just used for destructive purposes; the Angels look down from orbit and see about nineteen hurricanes beginning to form, with no weather-control system left to prevent them...
* ''Anime/PrincessTutu'': Mostly because the characters are [[spoiler: living in a tragedy and Drosselmeyer gets his kicks from making a person's good intentions be catalysts for the demise of those they're trying to help.]] The main character frequently makes everything worse courtesy of her humble attempts to help Mytho.
** In order to prevent Mytho from destroying his own emotion of love, Fakir cuts the mythical sword capable of doing so in half. It also ensured that his heart could not be shattered again. Now how could this possibly be a bad thing? [[spoiler: The piece of Mytho's heart that held love was recently bathed in raven's blood, thus corrupting it -- and now it's corrupting Mytho. The only way to get the thing out? Shattering his heart by using the very sword that Fakir destroyed.]] Whoopsie...
* ''Anime/CodeGeass'': In the first season, facing obliteration, Lelouch/Zero geasses Suzaku to "Live!" One year later... [[spoiler:Lelouch orders his best pilot Kallen in her new SuperRobot to ''kill'' Suzaku, which results in the Geass activating, forcing Suzaku to turn to his only remaining weapon: [[SphereOfDestruction an anti-matter nuke]]. Nice job nuking Tokyo, anti-hero.]]

** Lelouch uses a particularly grim example of his MindControl power: [[spoiler:"I could tell you to kill all the Japanese, and you would do it". And said power went into PowerIncontinence mode right at that moment. [[FromBadToWorse Nice job making your sister a mass murderer]].]]

** This trope could also be attributed to Ohgi and his culpability in [[spoiler:convincing the Black Knights to follow his lead in betraying Lelouch due to his gullibility regarding the claims of Schneizel and Villetta, which results in isolating Lelouch once and for all, and him ultimately going down the path of the Zero Requiem, which is largely an excuse for him to die as [[DespairEventHorizon he has lost all hope]], and him [[WoobieDestroyerOfWorlds causing more destruction than he otherwise would have]] for a peace that logically won't last very long, as it is built on a flimsy pretext. That the ending is as happy as it is, given the circumstances (Lelouch doing worse things than anyone in history), is pure NoEndorHolocaust at its finest]].
* In ''[[Anime/HellGirl Hell Girl: The Cauldron of Three]]'', Mikage is able to sense when someone nearby may soon be a client of Enma Ai. In one episode, she stops one such person and urges her not to use the Hotline to Hell... which she had ''never heard of until then''. Smooth.
* In the Season 2 finale of ''Anime/YuGiOhGX'', Kenzan tries to stop a brainwashed minion from firing the EarthShatteringKaboom by smashing the laptop computer that controls the satellite cannon. As soon as he does this, he learns the missile was just fired, and he's just destroyed the only means of stopping it!
** The hero wasn't immune to this either. When Judai was little, he had a card named [[StalkerWithACrush Yubel]] that was very protective of him. Whoever Judai dueled or was close to, Yubel would cause harm to them and made them fall into a coma. By Judai's request, Yubel was sent into outer space by Kaibacorp hoping [[AmbiguousGender they]] would absorb "the powers of justice" like his Elemental Hero Neos would. But instead they absorb powers the [[EldritchAbomination Light of Destruction]] and was driven insane. After landing back on Earth, they became Season Three's BigBad and orchestrated the events that happen to Judai and his friends.
* The biggest and baddest of the {{Big Bad}}s in the ''Manga/ZatchBell'' manga by name of Clear Note, [[spoiler:who planned to use the King's Privilege to [[KillEmAll bring genocide to the Mamodo,]]]] was powerful enough that it took Zatch and Brago's strongest spells to beat him. And what happens next? It somehow enables him to become powerful enough that [[OnlyTheAuthorCanSaveThemNow Makoto Raiku had to intervene.]] What's worse, Kiyo somewhat knew what would happen if they did what they did [[spoiler:thanks to his Answer Talker ability, which allowed him to determine the answer to any question in an instant]], but if they hadn't, Clear would have won anyway.
* In ''Manga/TsubasaReservoirChronicle'', Sakura leaves one of her memory-feathers behind in Acid Tokyo to keep the reservoir pure and the inhabitants alive. [[spoiler: While this act ultimately results in [[StableTimeLoop her birth]], the aging of the feather also allows the BigBad to win when he returns it to her body in the "several hundred years later" dimension.]]
** Also, [[spoiler:Syaoran]]. If only he could turn back time, everything would be okay and he could save her, right? '''''WRONG!'''''
** This is clearly becoming a theme, since it turns out that the entire plot was set into motion by [[spoiler:Clow's]] split-second wish that [[spoiler:Yuuko]] wouldn't die, though he didn't intend for it to turn out quite that way and the BigBad just happened to feel the same way, and believe strongly in the tenet of ScrewDestiny.
* The end of the Setsuna-arc in ''Manga/GaRei'': [[spoiler: Kensuke is killed, but after a long struggle and overcoming impossible odds, Kagura finally defeats the BigBad, making sure the evil hate-fox inside her ArtifactOfDoom never has to be summoned]]. She then proceeds to [[spoiler:''summon'' said hate-fox to revive him, resulting in the destruction of a good deal of Tokyo and nearly killing her in the process.]] If it weren't for the PowerOfLove, things could have gotten a lot worse...
* ''Manga/ACertainScientificRailgun'': Misaka finishes off the overpowered [[spoiler:Kiyama-sensei]], bringing an end to the Level-Upper Arc...except now the [[spoiler:entire network suddenly becomes unstable without her to control it, and it's just given birth to a [[EldritchAbomination weird...fetus...thing]], and now it's heading for a ''nuclear reactor''.]] And the only person who knows what's going on is out for the count.
* ''Anime/AngelBeats'': The Afterlife Battlefront spend an entire episode [[spoiler: discrediting Angel by making her score zeroes on her exams, and manage to get her fired as StudentCouncilPresident.]] Unfortunately, [[spoiler:compared to the passive Angel (who's only been ''reacting'' to the Battlefront's attacks), the guy who replaces her is a ''huge'' asshat, and the entire Battlefront gets wiped out and very nearly obliterated]].
* The entire plot of ''Manga/InuYasha'' is based on this. Kagome kills a demon that stole the Shikon Jewel and in the process shatters the aforementioned MacGuffin. This kicks off an incredibly drawn-out plot where the main characters have to fix the jewel and fight evil demons who want its power for themselves. Nice job breaking it, {{Miko}}.
* ''Manga/MagicalCircleGuruGuru'' has the characters discover Kukuri's birthplace where items for her use had been left behind. The bad news is the items had been collected by monsters called Kem Kems. Good news is they're tame and don't object to people taking back what's theirs. Unfortunately, they also don't object to people taking items and ''selling'' them, which is exactly what Nike, Kukuri, and Toma did prior to reaching the ruins. To make it worse, a necklace meant specifically for Kukuri was lost when Toma earlier used the item it was kept in as an impromptu rocket launcher. In the ''Doki Doki Densetsu'' version of the anime, Poor Kukuri simply snaps at this point and mentally regresses to a four-year old for a few moments. For the record, they ''did'' find the necklace soon after... in Old Man North-North's grass skirt...
* Manga example from ''Manga/{{Basara}}'': when [[EvilChancellor Momonoi]] is killed and the Red King retakes his city, Tatara and his rebel army plan on using the leftovers of Momonoi's gunpowder to blow up the water supply of the palace, making the Red King suffer. Too bad it results in the whole city having no water left and the citizens, formerly happy to be freed from their king turn against the rebels. A desert city cut off from water, good way to get their support hero.
* In the ''{{Manga/Berserk}}'' manga, Skull Knight manages to slash Femto from behind at the very moment of his apparent ascension, using his dimension-crossing sword to teleport and get the drop on him. [[spoiler:Unfortunately, Femto then redirects his strike towards the vortex of demonic power they are both standing on, and uses its dimension-bending to bring the unholy nature of that place closer to earth, thus bypassing the walls between Seen and Unseen by folding time and space, resulting in the energies of the Unseen manifesting physically on Earth. You've brought about ''HellOnEarth'', Skull Knight. Whoops. Guess that's what you get for bringing in [[WarpDrive sci-fi conventions]] into a [[HeroicFantasy Medieval Fantasy]] world!]]
** An earlier ''Berserk'' example: when the King of Midland has Griffith jailed and tortured for deflowering his daughter Princess Charlotte, Griffith accuses ''him'' of being attracted to her, since she looks just like his dead wife. Now, if those desires did exist, they were only subconscious -- the king would probably never have realized they were there. But Griffith's accusation makes him dwell on his daughter to the point of madness, and in one horrible moment he [[ParentalIncest forces himself on her]]. She stops him and he regains his senses, but the damage is done. Charlotte is traumatized; the king sinks into despair and insanity; and the Band of the Hawk, now the king's only targets for revenge, are hunted for years by Midland's army and worse. Good one, Griff.
*** As the Godhand Void would say, "[[YouCantFightFate everything happens within the flow of causality]]".
* In a way similar to the ''Magic Knight Rayearth'' example above, [[spoiler:the ''entire first half'' of]] ''Manga/KamikazeKaitouJeanne'' was this. [[spoiler:Maron/Jeanne is helping out God by sealing demons to keep Satan at bay and her [[SlapSlapKiss boyfriend/arch enemy]] Chiaki/Sinbad is an agent of the devil, right? Bzzt, wrong! It is revealed that Maron's angel sidekick Finn Fish is actually working for the devil and had been lying to Maron the whole time, and Maron was actually helping the devil and Chiaki God, not the other way around. So Maron had actually been ''helping'' the devil that whole time, making him stronger than ever.]]
* ''Manga/{{Bleach}}'':
** Don Kanonji has spiritual power but no formal training. He creates a show where children can watch a "hero" slaying creepy ghosts so they can sleep soundly at night knowing they're safe. However, he destroys the ghosts by breaking open a "hole" in their chest, causing them to vanish. What he doesn't realise is that the "vanishing" is really a transformation process, that he's inadvertently performing hollowfication, and is therefore creating the very monsters he wants to protect children from.
** Guessing Orihime's unique power is valuable to Aizen, Urahara takes her off the front line to prevent her being targeted but doesn't admit why he's doing it. Rukia takes Orihime to Soul Society to train her for front line battle takes her away from Urahara's watchful eye, and allows Aizen to stage a kidnapping within the Dangai. The Dangai is supposed to be impossible to break into, so people traveling there are very vulnerable. However, the person who figured out how to break into the Dangai was Urahara himself, the only man capable of predicting and countering everything Aizen does. Urahara ends up kicking himself for his mistake.
** In the [[{{filler}} Zanpakutou Tales Arc]], Ichigo confronts Muramasa in front of the sealed Yamamoto and attempts to strike him down with his full power. This is exactly what Muramasa wanted. [[spoiler:Ichigo had thought Muramasa sealed Yamamoto, but Yamamoto had sealed himself away from Muramasa. Ichigo's attack provides Muramasa with the power he needs to break Yamamoto's seal and steal Ryuujin Jakka.]]
** Yamamoto unleashes his full power, including his [[ThePowerOfTheSun Bankai]], on TheEmperor of the Vandenreich and successfully defeats him.... only to find out it was a double. The real Yhwach shows up, having been able to fully witness and understand Yamamoto's power, which allows him to steal the [[StoryBreakerPower most powerful Bankai in existence]].
** After his training with the Royal Guard, Ichigo is given armor made of the "King's Key", allowing him to race back to Soul Society at top speed and fight the Vandenreich invasion, without ever needing to slow down due to air friction burning him. The problem is that doing so ''also'' breaks all the barriers keeping the Vandenreich out of their actual goal, the Soul King Palace, and those barriers can't be recreated for 6000 seconds after their destruction. [[BigBad Yhwach]] proceeds to sarcastically praise Ichigo as being the great hero ''of the Vandenreich'' for this.
* In ''Manga/{{Kinnikuman}}'', all the choujin were celebrating Kinnikuman's victory in the Choujin Olympics. At one point, they toss him so high into the air he goes [[FridgeLogic flying into outer space]] and bumps into a satellite. As it turned out, that satellite was a prison for the Devil Choujin and that bump hit the release button.
* The ''Anime/{{Patlabor}}'' TV series features a pretty epic one, with a simple HonorBeforeReason decision in an early throwaway episode snowballing into an increasingly deadly story arc that would dominate the later half of the show. Captain Nagumo is opposed to using the prototype Patlabor SRX-70 Saturn created by [[MegaCorp Schaft Enterprises]] because she knows they're going to use the motion data from the police's skirmishes to develop military mechs. All well & good, but because Nagumo threw the Saturn away, CorruptCorporateExecutive Utsumi decided to get the Patlabors' data another way, namely smuggling pre-production military Labors into Tokyo & causing havoc in the streets to draw the Patlabors out.
* In ''Manga/MahouSenseiNegima'', all of Ala Alba went to the Magical World, including the [[spoiler:unbeknownst-to-them-Princess Asuna]]. Asuna is then kidnapped by Fate and the Cosmo Entelecheia remnant, who do... ''something very ominous'' relating to her AntiMagic powers. [[WildMassGuessing The going theory]] is that by bringing the Princess to where the bad guys can get her, ''they directly caused the revival of the BigBad''. Good going.
* In the Ark arc of ''Manga/DGrayMan'', WideEyedIdealist [[AllLovingHero Allen Walker]] is facing off against Tyki Mikk. During the fight, Tyki accidentally pushes him into a NextTierPowerUp, and his EmpathicWeapon turns into [[spoiler:a [[{{BFS}} really big sword]]]] that can't damage humans- only Akuma and Noah. Tyki had been relying on Allen's [[ThouShaltNotKill reluctance to kill another human]], so he was a bit surprised when Allen [[spoiler:stabbed him right through the chest in an attempt to remove the Noah from him.]] It seems to have worked for a while... but then it turns out that [[spoiler:all Allen managed was to wake it up, and Tyki goes BodyHorror OneWingedAngel.]] [[OhCrap Woops]].
** He makes a very similar (and also understandable) mistake later: [[spoiler:While fighting a Level 4 Akuma, in order to trap it, he deliberately makes himself a target, then summons his sword from across the room, impaling both the Level 4 and himself. This would have worked fine if it wasn't for the [[TomatoInTheMirror little snag]] that he's the host for the Fourteenth Noah. Even the Akuma looked terrified out of its mind before he managed to suppress it.]]
** Kanda, in the most recent chapters, when he [[spoiler:goes berserk and impales Allen with Mugen (his Innocence-forged sword), which causes Allen to collapse and his skin to change into that telltale Noah gray color. The Millennium Earl is positively dancing with joy when this happens, and gleefully thanks Kanda for fully awakening the Fourteenth.]] Oops....
* In ''Manga/DeadmanWonderland'', Ganta stops the Deadmen from wiping out the Forgeries because one of his friends was among them. In doing so, he inadvertently incapacitates all of the prison's strongest Deadmen leaving the Forgeries free to start picking them off one by one. As a result, Ganta is [[WhatTheHellHero completely alienated by his friends]].

* Way to go, Manga/{{Nausicaa|OfTheValleyOfTheWind}}. In the manga version, you've saved your people, but you've also [[spoiler:doomed humanity by destroying the pure, corruption-free genes that have allowed humanity to survive.]] She believes in [[HistoryRepeats the natural cycles]], but what she fails to realize is that [[spoiler:there will BE no cycles for mankind if they're all dead.]]
* In the ''Anime/EurekaSeven'' anime: [[spoiler: Nice job saving the girl in a coma, Renton.]]
* In ''Anime/FullmetalAlchemist: [[TheMovie Conqueror of Shamballa]]'', [[spoiler:Al opens the gate between his world and ours as the Thule Society does on our side, in an attempt to rescue his brother Ed. Though Ed escapes, it also allows the Thule Society to launch a full scale war on Amestris, and nearly destroys the capitol city]]
* In ''Manga/YuYuHakusho'', the Chapter Black saga, Yusuke allowed [[BigBad Shinobu Sensui]] to fully power up so they could have a good battle. This ended up getting him killed. Dangit, Yusuke, you made Kuwabara cry again!
** Of course this led to a NiceJobFixingItVillain moment as Yusuke was resurrected as a mega-kickass demon, but he didn't know he was a hidden demon at that time.
** Don't forget that the whole arc was just Sensui's plan [[spoiler:to get himself killed by a powerful demon as justice for killing countless demons. Unleashing HellOnEarth against what he sees as a corrupt human race is just frosting added by an enraged Kuwabara.]] Nice job, dimwit.

* ''Anime/{{EL}}'' takes place AfterTheEnd, which happened because some of the worlds major powers decided to put an end to environmental pollution... by [[AMillionIsAStatistic nuking most of humanity]], and [[ThereIsNoKillLikeOverkill nearly all other life on earth]], out of existence.
* In episode one of ''LightNovel/ACertainMagicalIndex'', Touma destroys Index's magically MadeOfIndestructium cloak to prove he has AntiMagic. This leaves her defenseless and she becomes grievously wounded later.
** Much later, during the Sisters arc, Touma [[spoiler:fights Accelerator, which turns out to be the boost he needed to reach Level 6]]. Thankfully subverted when Touma managed to fix the problem [[spoiler:by knocking out Accelerator before he manages the shift]].
** In ''New Testament'', Ollerus tries to halt Othinus's plans for absolute power by using a transformation spell to remove her Magic God powers, making them fail 100% of the time instead of the usual 50%. [[spoiler:Othinus just laughs and reveals that Ollerus basically just handed her omnipotence on a silver platter: if anything she tries is going to fail, then she just has to ''fail at failing'', and she can pretty much do whatever she wants.]]
* In ''Manga/TheWorldGodOnlyKnows'' manga, [[spoiler: Haqua released Fiore out of mercy when Fiore showed "evidence" that she is innocent. Later on, Nora tries capturing her but both Haqua and Nora were restrained. So yeah, Haqua, maybe you should have followed Keima's instructions. Nice job breaking it, Haqua.]]
* ''Anime/YuGiOh5Ds'': The five Signers think they've successfully stopped the season's BigBad and saved the world by defeating him in a duel, only to shortly realize they've brought his EvilPlan to fruition, as, [[XanatosGambit regardless of their victory, the duel completed "the Circuit,"]] allowing the Arc Cradle to descend over New Domino and begin the countdown to the city's destruction.
** Jack is indirectly responsible for Carly [[spoiler:dying and [[CameBackWrong coming back wrong]]]]; while he left her to [[ItsNotYouItsMyEnemies protect her from the Dark Signers]], he failed to explain that, and was so brusque about it she decided to investigate them to prove she ''was'' useful. This led to [[spoiler:Divine killing her]] and her subsequent [[spoiler:resurrection as a Dark Signer...whom Jack [[{{Irony}} had]] [[FightingYourFriend to]] [[TearJerker kill]]]].
* [[BadassPreacher Shiranui]] suffers through a particularly horrific one in the early chapters of ''Manga/KagerouNostalgia''. He and [[HiredGuns Kazuma]] are staying with a woman whose husband left, planning to travel to the capital and assassinate [[GeneralRipper General]] [[EvilOverlord Kiyotaka]] [[ZeroPercentApprovalRating Kuroda]], leaving her and their daughter behind. The husband subsequently returns with a band of mercenaries and massacres the town; when his wife confronts him and accuses him of People Hunting (a form of massacre endorsed by Kuroda), he does not seem to understand what she is talking about. Shiranui realises that the man has been tainted by the darkness in the capital and purifies him. ([[spoiler: Horrified by what he has done the husband promptly murders his wife and daughter, and then commits suicide while Shiranui looks on, unable to bring himself to stop the killing by shooting another human being.]]) Nice job breaking it, priest.
* While they can't be fully considered "Heroes" the Marines in ''Manga/OnePiece'' cause this following [[spoiler: The Whitebeard War. Their long, elaborate plan to kill Whitebeard worked, and they also killed off the son of the Pirate King (Ace). The only problem is that in doing so, they horribly screwed up the power balance of the New World, causing several towns to get overrun by pirates. Also, since Whitebeard confirmed that One Piece existed with his dying breath, the piracy rates have practically DOUBLED. To make matters worse, Blackbeard managed to free some of the worse criminals in the history of the world, added them to his crew, and has now stolen Whitebeard's Devil Fruit, which is capable of causing untold carnage, before finally declaring war on the World Government. And to top it all off, the Elders decided to censor the escape of even more of the Level 6 prisoners, meaning they can do whatever the hell they want. So basically, they wound up screwing up the Entire World thanks to a horribly short sighted plan. Then the cover-up of the Level 6 prisoners' escape causes Fleet Admiral Sengoku to resign in disgust, leaving a secession crisis for who will lead the Marines. To settle this, a duel is held between Admirals [[GeneralRipper Akainu]] and [[ReasonableAuthorityFigure Aokiji]]. Akainu wins, and Aokiji leaves the Marines. Thus, two of their four most powerful members are gone. BRAVO. [[SlowClap *Clap* *Clap* *Clap*]] ]]
** The actual protagonists fall into this on occasion as well. Luffy's jailbreak at Impel Down let a bunch of inmates out of prison. Granted, it's reasonable to assume that a fraction of them were actually decent guys like Mr. 2, Jimbei, and the Newkama pirates, but the majority was made up of dangerous criminals. Also, Franky blew up the labrotory of the greatest scientist in the world... twice. He saw the BigRedButton with the skull 'n crossbones on it and thought [[WhatAnIdiot that it must be a pirate button.]]
* ''Anime/PuellaMagiMadokaMagica''.

* In ''Manga/PuellaMagiKazumiMagica,'' poor, poor Pleiades Saints. [[spoiler:Their plan is to hide Kyubey from existence, making it unable to contact and contract other girls, including preexisting [[MagicalGirl Magical Girls]]. To help this, they make Jyubey, an artificial Incubator, who supposedly can clean darkening Soul Gem. Only, there's a bit of a problem: It can't. It can only polish them. Whoooops.]]
* Early in ''Anime/SummerWars'' Kenji gets a text message with a math algorithm challenging him to solve it. He spends all night doing so, and when he wakes up finds that the online world OZ used by most of the world has gone haywire and that the algorithm he solved was in fact the company's strongest security code. [[spoiler:Ultimately subverted, though, in that over fifty other people made successful attempts on the code ''and'' Kenji actually made a mistake in his resulting in it being incorrect.]]
* ''Anime/{{Doraemon}}'' should have a lot of examples throughout the show's run. It at least happened in the movie, "[[Anime/DoraemonNobitaInTheWanNyanSpacetimeOdyssey Nobita in the Wan-Nyan Spacetime Odyssey]]". Nobita finds stray dogs and cats and wants them to have a home. The gang time traveled them back 300 million years and providing them with evolution and a food making machine. When they visit them again, they encounter a time disturbance causing them to be stranded in a different year in that era with advanced sentient dogs and cats, thus started the movie.
* In VisualNovel/{{Tsukihime}}, if it weren't for Shiki "killing" Arcueid, Arcueid could effortlessly defeat all her enemies and Shiki himself wouldn't be dragged into her business.
** Actually, this isn't quite accurate. [[spoiler: In the sequel story, Melty Blood which takes place 1 year after the end of Tsukihime, its shown that given enough time Arcueid would eventually regain her powers. Its just that the entire Tsukihime story takes place over the course of a few months and Arcueid spends most of that time either hanging out with Shiki or tracking down and fighting enemies instead of resting.]]
* Several of Makoto's leaps in ''Anime/TheGirlWhoLeaptThroughTime'' would unintentionally break something else while trying to undo something she had broke due to leaping for her personal gain. One example is Makoto swapping places with another classmate in Home EC, causing him to cause the accident in the room that Makoto would have caused. However, this accident would make said classmate a target to bullies. When her friend Chiaki confesses to her, she uses her time leaps to avoid talking to him and he became frustrated with her and eventually decided to date Makoto's friend Yuri. Which would incidentally lead to [[spoiler: Makoto becoming jealous and realizing her feelings for Chiaki.]] Later, when the bullied classmate snaps and throws a fire extinguisher at Makoto, Chiaki attempts to shield her. Makoto then time leaps to tackle him out of the way ... only for the fire extinguisher to hit her friend Yuri instead.
* ''Anime/SaintSeiya'': Oh all the places to [[spoiler: lock your EvilTwin brother Kanon]] in as punishment for his evil, you shouldn't have chosen [[spoiler: the DrowningPit under the Sanctuary]]! Because if you had not done that, then [[spoiler: Kanon wouldn't have almost drowned and fallen in a hole thrrough the rock wall... which took him towards Poseidon's realm, and allowed him to become the ManBehindTheMan in the Poseidon saga.]] ... Ooops.
* ''Manga/MermaidMelodyPichiPichiPitch'' has Caren [[AloofAlly refusing to join the mermaid trio]]. Good idea for her, but it's a bad idea since that allows the Black Beauty Sisters to capture her.
* In Manga/HaouAiren... Great, [[spoiler: Hakuron]]. When [[spoiler: your girlfriend Kurumi tried to run away and befriended this kid named Kaafai]], you reacted via [[spoiler: raping her in front of him and then letting him live]]. That's not gonna backfire in the future, huh? [[spoiler: Well, guess who is the kid who has just '''shot you to death''' in your wedding day? Yup, it's Kaafai himself, the same boy whom you stupidly allowed to live.]]
* In ''LightNovel/LoveChunibyoAndOtherDelusions'', Rikka's family [[spoiler:hid her father's illness from her in order to protect her. Granted she was a child and probably would have had a hard time dealing with it. But his sudden death makes it [[BreakTheCutie very hard for her to accept it]].]]
* The backstory to ''Anime/HeartcatchPrettyCure'' is this: Yuri and her fairy partner, Cologne, realize that the Desertians are getting stronger. With two new fairies, Chypre and Coffret, around, Cologne urges Yuri to use them to find help, but she declines, not wanting to burden others with the job and instead decides to try to obtain the Heartcatch Mirage. [[spoiler: When she does so, the Dark Precure is waiting for her at the Precure Palace and Yuri tussles with her, leading to Cologne's death, her depowering and shouldering the responsibilities of saving the world to an InnocentFlowerGirl and her GenkiGirl best friend with [[JerkAss no brain-to-mouth filter]].]]
** The same goes with ''Anime/YesPrettyCure5'' as it was Coco's kindness that allowed Nightmare to get into the Palmer Kingdom and destroy it.
** And the same goes with ''Anime/HappinessChargePrettyCure'' as [[spoiler:it's ''Hime'' who ended up opening up Axia Box and unleashing the Phantom Kingdom.]]
* [[spoiler:Reiner and Bertolt]] from ''Manga/AttackOnTitan'' might have been captured without incident if Eren hadn't mentioned their village at that particular moment. Instead, it leads to [[spoiler:Bertolt]] suggesting they should go home and [[spoiler:Reiner]] confessing the truth to Eren, causing things to rapidly go downhill from there.
* In ''Anime/UmiMonogatari'', Urin lets Sedna's sky half out while looking for the ring, and Kanon threw the ring away in the first place.
* In ''Anime/TokyoMajin'', Tatsuma attempts a BatmanGambit to redeem [[BigBad Chaos]], who claimed to be devoid of emotions other than hate and killed and/or drove insane dozens of peple (including Tatsuma's foster parents) ForTheEvulz. Tatsuma tries to kill Chaos with kindness and forgiveness, eventually provoking an emotional outburst from Chaos, which proved he could feel emotions, which is what Tasuma wanted. Unfortunately for him, it's also what [[GreaterScopeVillain Yagyu]] wanted, as he uses that breakthrough to unlock Chaos' full powers and [[GrandTheftMe possess him.]] And the first thing he does with his new found powers? [[TokyoFireball Blow up Tokyo.]] Whoops.
* In episode 2 of ''LightNovel/TheTestamentOfSisterNewDevil'', Basara tells Mio not to let anyone at their school know that they're living together, lest it causes a scandal. Unfortunately, after he introduces himself to her class after transfering there, the class rep, Yuki, gives him TheGlomp, and turns out to be a childhood friend of his. This causes some jealousy in Mio, who then lets it slip that they're living together.
* In episode 9 of ''Manga/GourmetGirlGraffiti'', Kirin's mother tells her to get a seat reserved on the train. Kirin mentions she's already done it and continues watching television. Unfortunately when they get to the station, it's completely full, and Kirin is forced to wait another hour for the next train since she didn't bother getting a ticket.
* In episode 4 of ''LightNovel/UnlimitedFafnir'', Tear getting a little angry in the auditorium and nearly destroying it causes the other students to be quite fearful of her as a result. Fortunately Yuu, Mitsuki, and Iris help her to open up more to her classmates and to control her power to avoid more incidents like that.

** Topping ''that'' is what Zor does in the final episode of the "The Masters" saga: knowing that, with the Masters being destroyed, it's only a matter of time before the Invid Sensor Nebula detects the Flower of Life on Earth, he crashes the last Masters' mothership on the mounds inside which the Flower is growing to try and destroy it... But only succeeds into ''seeding the whole planet with the Flower of Life '''and''' making the Sensor Nebula notice it early'', resulting in the Invid dropping whatever they were doing and coming to Earth before the Southern Cross can rebuild. {{Lampshaded}} by ''the episode title itself'', "[[ExactlyWhatItSaysOnTheTin Catastrophe]]".
* Due to impure motives, Koyomi in ''LightNovel/{{Bakemonogatari}}'' actually usually makes peoples' problems worse rather than better, the more so the more he gets involved directly in trying to fix them. Namely, while he appears heroic, he's actually more interested in sacrificing himself for others than actually helping them.
** In Koyomi Vamp he saves a dying vampire simply because he's suicidal and thinks it's a good way to die. When she recovers fully after he finishes defeating the HeroAntagonist group after her, he realizes he just revived what may be the most powerful being on the planet, which eats people at least once a month.
** With Kanbaru his suicidal tendencies make him decide that the best way of solving her problem is just to get killed by her so that she'll get what she wants. His girlfriend has to step in and point out that this won't get Kanbaru what she wants, causing her to give up. Later, it turns out that Koyomi's poor handling of the situation has convinced Kanbaru that deep down she's a murderer who was simply stopped before she could commit a crime.
** With Nadeko he tries to help her without having any idea what she's doing and her curse ends up more dangerous as a result. When the problem is "fixed" it still results in one of the people who cursed her getting attacked by the snake, even though he probably didn't really know it would work. He also fails to address her misdeeds in this arc, simply ignoring that she butchered a bunch of innocent animals in an attempt to cure herself when she was actually perfectly safe. [[spoiler:This isn't the only cause for the Nadeko Medusa incident, but it's just another time people give her a pass because she's cute.]]
** [[spoiler:Even after freeing her of the snake curse, Koyomi is unable to tell Nadeko he doesn't like her ''that way'' because he's [[AllLovingHero just too nice]] ([[ObliviousToLove or just too oblivious]]), and fails to see Nadeko growing more and more jealous. Down the line this leads to Nadeko becoming a god and nearly killing both him and Shinobu, and they are only allowed to live because Senjougahara talked Nadeko out of it almost the same way she did with Suruga. Even after she spares them, Nadeko threatens Koyomi and Senjougahara's lives, and all this happened because he just couldn't take a chance to hurt her feelings. After being able to save their lives unlikeliest of situations, [[ConMan Kaiki]] is the one to inform Koyomi that caring about others sometimes can cause more problems than it helps.]]
** When he assists Tsubasa with her demonic cat problem, he ignores the obvious emotional issues that caused it and urged her to keep bottling up her emotions, causing two more incidents as she tried to live up to his image of her despite the obvious cause of her problems. Not only that, but in the first incident he nearly ''kills'' her thanks to his foolish plan to forcibly separate her from the meddlesome cat. Even if his plan had actually worked, she would have been responsible for the murder of the guy she liked.
* ''Manga/FairyTail'': The guild can never complete a mission without pulling this off, mostly through collateral damage.
* ''Manga/PandoraHearts'' has a couple of examples, but perhaps most notable amongst them is Zai Vessalius, who goes beyond the basics of this trope to become a rather original [[DeconstructedTrope deconstruction]]. Though how this happens is [[JigsawPuzzlePlot far too complicated to explain here]], the idea is that, while Zai realizes the mistake he made, the same flaws that led to the initial mistake prevent him from fixing it and only make things worse, because his harping over his past mistakes makes him unable to cut his losses and grow as a person. Interestingly, this makes the originally noble-intentioned hero in question an ''[[GreyAndGrayMorality antagonist]]'' to the series' protagonists, who at least are actually trying to move on.
* ''LightNovel/WatashitachiNoTamuraKun'' has this in a romantic triangle situation, where secondary characters end up accidentally hurting both females in the triangle, and almost ruin the chances for anyone to end up in a relationship. Tamura's friend Takaura has been talking to Matsuzawa on the phone and telling her about Tamura's current activities, including his budding relationship with Souma. Hachiya, the well meaning school nurse and confidant for Souma, pushes Souma and Tamura to move forward faster in their budding relationship than they probably should be. While both of them are well meaning, their actions cause some serious anguish for the love triangle, although it seems to work out in the end.
* In ''VisualNovel/ShoujotachiWaKouyaOMezasu'', The Typhoon game company CEO challenges the Rokuhara club to a contest to see who can sell more games on their launch date after being splashed in the face with a glass of water due to her aggressive recruiting attempts of various club members.
* ''Anime/YuGiOhTheDarkSideOfDimensions'' starts when an excavation team finds the pieces of the Millennium Puzzle, as well as the Tablet of Memories, in the burial chamber. Also, most of the problems in the movie can be directly traced back to Kaiba and Shadi.
* The entire Wiseman arc in ''Manga/SailorMoon'' is one humongous set of this trope, particularly starting with the first half. The entire thing kicks off when Chibi-Usa accidentally absorbs the future Silver Crystal, leading to Crystal Tokyo to come under attack. This forces Chibi-Usa to go back into the past to find the past Silver Crystal as she thinks the future one is lost forever. At the same time, King Endymion decides to put his past self, Mamoru Chiba/Tuxedo Kamen, through a SecretTestOfCharacter by giving him strange prophetic dreams of some disaster happening involving him and Usagi, hoping that he can solve it and the two can handle anything together. Instead, Mamoru bombs it big time as he decides the best thing to do is to ''dump Usagi and not say why''. Needless to say, Mamoru's pissed when the king tells him what went on. And finally, when Chibi-Usa discovers Usagi is Sailor Moon and that she has the Silver Crystal, she's so indignant that she has the item that she declares her unworthy and steals the crystal and the Crystal Dream brooch, allowing Rubeus to strike and kidnap the other Sailors while Usagi is powerless.

** The ''Musha Kero'' saga ends with one. [[spoiler:Upon learning that civilians have been enslaved to unearth something in a mine, Kululu scans the area and finds an energy reading, and Keroro speeds up the excavation. It turns out to be an EldritchAbomination.]]
* In one of the early arcs from ''Manga/{{Toriko}}'', titular character gives Komatsu his special, gunpowder-charged firecrackers for scaring off dangerous animals, knowing that he didn't have superpowers to defend himself. However, he went a little bit too far with explosive power. As the result, after crackers exploded, sound not only scared off predators, but also ruptured both of Komatsu's eardrums and ''stopped his heart''. Luckily for him, Jiro managed to reanimate him.
* ''Manga/AkagamiNoShirayukihime'': Tariga started having a melt down after he realized that Touka had arrived but Tsuruba hadn't been seen as [[spoiler: it meant Tsuruba was likely dead]]. Unfortunately he reacted to this revelation by using a KnockoutGas on [[spoiler:Touka's]] guards in order to confront him and the heartless noble's BreakingSpeech worked wonders, with Tariga nearly stumbling from the room while leaving it unguarded, unlocked and with the unconscious guards weapons now handy for the villain.
* ''Webcomic/AxisPowersHetalia:'' In the ''Running Away With Mr. Swe'' strip, [[NiceGuy Finland]] decides to follow [[GentleGiant Sweden]], who's fed up with Denmark's attitude and being controlled, and run away to live on their own. While he's at first glad that he's gotten away from Denmark, it doesn't take long for Finland to start mentally kicking himself for his spontaneous decision, considering the person that he ran away with has a FaceOfAThug and IcyBlueEyes. He's so terrified of Sweden that he decides he can't live with him and makes plans to run away in the middle of the night while Sweden is asleep...only to have his [[ThwartedEscape escape attempt thwarted]] by an unknowing Sweden himself.
* In the anime/manga ''Literature/TheHeroicLegendOfArslan'', Bahman was having ConflictingLoyalty after finding out that [[spoiler: Silvermask was the former prince Hilmes]]. But in his desperation to stop Kishward, Daryun and the others from killing [[spoiler: Hilmes ]], he [[spoiler: blurted out that if they do, they will be extinguishing the royal line]] while in front of Arslan, emotionally shattering the poor boy's world. This also allows [[spoiler: Hilmes]] to escape in the confusion. Narsus was [[EnragedByIdiocy furious]], thinking to himself that he should cut Bahman down for such actions.
* When Elma and Tohru first met in ''Manga/MissKobayashisDragonMaid'', Elma was attempting to bring about peace among the humans in the other world. It resulted in a cult that was prepared to go to war with anyone who wouldn't worship her -- [[ThroughHerStomach getting Elma to look the other way by bribing her with food]]. Tohru's outrage at Elma's hypocrisy [[WeUsedToBeFriends led to them having a falling out]] and becoming rivals.
* In ''Anime/GundamBuildDivers'', our heroes are in a conundrum: [[DiskOneBoss Tsukasa Shiba]] is poised to destroy the Gunpla Battle Nexus Online game through his ultimate Break Decal mounted on a [[Anime/MobileSuitGundam Big Zam]], making him invincible as it modified the Gunpla's armor to be stupidly strong. As everyone's trying to figure out what to do, [[MysteriousWaif Sarah]] declares her desire to protect their game world, somehow causing [[TheHero Riku's]] Gundam 00 Diver Ace to sprout energy wings that helped eradicate that device and allow everyone to save the day. All's well that ends well, right? Nope! [[spoiler:As it turns out, Riku and his friends later find out that Sarah is actually an AI accidentally created by the game, that the wings were the manifestation of her powers awakening and that her essence was accidentally spread all across the servers, threatening to destroy the game ''again''.]]

* When Elma and Tohru first met in ''Manga/MissKobayashisDragonMaid'', Elma was attempting to bring about peace among the humans in the other world. It resulted in a cult that was prepared to go to war with anyone who wouldn't worship her -- [[ThroughHerStomach getting Elma to look the other way by bribing her with food]]. Tohru's outrage at Elma's hypocrisy [[WeUsedToBeFriends led to them having a falling out]] and becoming rivals.

* ''Anime/MobileSuitGundam00'' gives us a Nice Job Breaking It ''Villain''. Near the end of Season 1, the BigBad's assassination of [[spoiler:the hibernating Aeolia Schenberg]] triggers a DeadManSwitch which [[spoiler:unlocks the Gundams' SuperMode.]] With this advantage, the good guys have a fighting chance in what had previously been an all but impossible battle. Thus, in the first season finale, [[spoiler: They manage to kill the BigBad and fight the remainder of his forces to a bloody stalemate.]]

* ''Manga/PokemonSpecial'':

* In ''Anime/TokyoMajin'', Tatsuma attempts a BatmanGambit to redeem [[BigBad Chaos]], who claimed to be devoid of emotions other than hate and killed and/or drove insane dozens of peple (including Tatsuma's foster parents) ForTheEvulz. Tatsuma tries to kill Chaos with kindness and forgiveness, eventually provoking an emotional outburst from Chaos, which proved he could feel emotions, which is what Tasuma wanted. Unfortunately for him, it's also what [[GreaterScopeVillainYagyu]] wanted, as he uses that breakthrough to unlock Chaos' full powers and [[GrandTheftMe possess him.]] And the first thing he does with his new found powers? [[TokyoFireball Blow up Tokyo.]] Whoops.

** Since Heero was the one who actually pulled the trigget to kill all the UESA leaders, you could say "[[IncrediblyLamePun Nice Job Breaking It, Heero]]."

** The hero wasn't immune to this either. When Judai was little, he had a card named [[StalkerWithACrush Yubel]] that was very protective of him. Whoever Judai dueled or was close to, Yubel would cause harm to them and made them fall into a coma. By Judai's request, Yubel was sent into outer space by Kaibacorp hoping it would absorb "the powers of justice" like his Elemental Hero Neos would. But instead it absorb powers the [[EldritchAbomination Light of Destruction]] and was driven insane. After landing back on Earth, it became Season Three's BigBad and orchestrated the events that happen to Judai and his friends.

* In the anime/manga ''Literature/TheHeroicLegendOfArslan'', Bahman was having ConflictingLoyalty after finding out that [[spoiler: Silvermask was the former prince Hilmes]]. But in his desperation to stop Kishward, Daryun and the others from killing [[spoiler: Hilmes ]], he [[spoiler: blurted out that if they do, they will be extinguishing the royal line]] while in front of Arslan, emotionally shattering the poor boy's world. This also allows [[spoiler: Hilmes]] to escape in the confusion. Narsus was [[EnragedByIdiocy furious]], thinking to himself that he should cut Bahman down for such actions.