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6InsaneTrollLogic in anime and manga.
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9* Seryu Ubiquitous of ''Manga/AkameGaKill'' is so obsessed with justice and bringing criminals to it, that she believes that any crime is punishable by death and outright thinks the ultimate justice is killing people before they are able to ever commit a crime. After killing a group of bandits and rescuing their prisoner, she ''kills'' the woman for helping the bandits, despite her having only done so under threat of her own life.
10* Osaka from ''Manga/AzumangaDaioh'' is full of this, but one case stands out in particular: she concludes she has to drown in order to learn how to swim, since drowned people always float (she had not yet figured out how to float). She also concludes that, since snails are not insects, they must in fact be bugs.
11* Sarada Uchiha from ''Manga/{{Boruto}}'' really takes after her father when it comes to nonsensical reasoning. She starts to believe that her mother is not her biological mother because none of her parents wear glasses, while she does, and runs away from home. Even when it's pointed out how much she resembles her mother both physically and personality-wise, she still believes that another random woman from Sasuke's past is her real mother, simply because they both wear glasses, and not because they have any sort of physical resemblance. Then she asks Suigetsu, who is known for being quite dumb, to run a DNA test that gives a 100% match from an unknown tissue (which turns out to be Sarada's own umbilical cord, not that she knew this). In the end, it turns out that the one she thought was not her biological mother, '''WAS''' in fact, her biological mother, while the other was just the midwife.
12* In ''Manga/CodeBreaker'', pretty much everything that comes out of the "[[IronicName Angels]]'" mouths.
13** Why do the [[DiabolusExNihilo Angels]] want to kill countless normal people? Because normal people do not know the value of life, which in turn makes them evil.
14** And how are they planning on proving that humans don't care about life? By setting up a voting system where people can chose to either let hardcore violent criminals, for whom they give graphic details of their heinous crimes and who were previously on death row, live or die. Because if they choose die, that means people will kill others for no reason. The fact that most of the people voting assume it's a joke doesn't matter.
15** They release all of the criminals and tell them that if they can flee they can live, then they call them scum because they are committing crimes so they can escape being killed by them.
16* In Literature/CombatantsWillBeDispatched, when No. 6 questions if the warp device has been tested before they use it on him:
17--> '''Lilith''': If I keep running tests and an accident occurs, the success rate won't be 100% anymore! That means the chances of this succeeding will also fall!
18* ''Anime/Danganronpa3TheEndOfHopesPeakHighSchool'': Ruruka Andou believes that the only good thing about herself is her ability to make sweets. It's a standard belief for students at Hope's Peak Academy to think that their Ultimate Talent is what gives them worth, but what pushes Andou into insane territory is the fact that she believes that anyone who can't and/or won't eat her sweets must hate her. This includes her best friend, Seiko Kimura, who will most likely die if she eats too much sugar. The official manga anthology shows a flashback to their childhood, where Kimura nurses a cat that Andou accidentally poisoned with one of her sweets to back to health, and explains that cats can't eat chocolate like humans can. [[ItsAllAboutMe Andou immediately stops caring about the cat, because in her mind, it obviously hates her since it's physically incapable of ingesting her sweets]], and tells Kimura that she and the cat "deserve each other".
19* In ''Manga/FairyTail'', Happy's answer to questions like "how can you fly?" and "why are you blue?" is "[[WildcardExcuse because I'm a cat]]", even though the exact reason people ask is because they ''are'' aware he's a cat and wonder how a cat can fly and be blue. However, even Happy is taken aback by Wally's weird logic: When Millianna captures Happy, she finds out he is a talking cat and surprisedly tells it to Wally. Wally corrects her by saying: "You cannot say that he is a talking cat. The fact that he is able to talk ''makes'' him a cat". So according to Wally, all humans are cats.
20* ''Manga/FruitsBasket'': Machi's [[MyBelovedSmother mother]] takes it to ludicrous levels. When she came across Machi placing a blanket over her baby brother at night, rather than accept Machi's far more believable or logical explanation that she was trying to keep him warm, Mrs. Kuragi immediately assumes that she was trying to [[MistakenForMurderer smother him]] out of [[InfantSiblingJealousy jealousy]] and kicks her out of the house.
21* ''Manga/FullMetalAlchemist'': Give Ed enough time, and he'll find a way to find anything and everything to be an insult about his [[HeightAngst height]]
22* ''Anime/GaoGaiGar'' has a bit of this in the first episode.
23--> "The chance of success is pretty close to 0%"\
24"Scientific calculations mean nothing! A courageous heart can make ''anything'' possible!"
25* ''Literature/HighSchoolDxD'': [[BadassPacifist Sirzechs]] (Yes, ''that'' [[{{Ambadassador}} Sirzechs]]) once spent what is implied to be several days (if not a few weeks) straight out stalking Issei as Satan Red in an attempt to take back Millicas's (his son) admiration from Oppai Dragon. [[ItMakesJustAsMuchSenseInContext It is exactly as insane as it sounds]].
26* [[{{Cloudcuckoolander}} Katsura]] from ''Manga/{{Gintama}}'' in particular deserves a special mention for believing that Gintoki could hide inside a tin can and writing an exam consisting of problems like ''"There are 10 Shinsengumi members. Six Anti-Foreigner Faction members run into them. Three Anti-Foreigner Faction members are killed. The Anti-Foreigner Faction members kill two Shinsengumi members but six more join them and two Anti-Foreigner Faction members are injured. '''How many noses does Creator/{{Jackie|Chan}} have?'''"''
27* In ''Literature/TheHeroicLegendOfArslan'', this is Silvermask/[[spoiler: Hilmes]]'s reasoning and excuse for killing innocent Parsians who had nothing to do with the politics of the royal family. It is because they dared support a usurper of the throne and they deserve to die at the hands of the "rightful king" as punishment. So Silvermask has the full right to kill them as the rightful king, even if at this point he does not have the throne.
28* ''Literature/JigokuNoGoukaDeYakaReTsuzuketaShounen:'' The old lady who allows Flare, Primavera, and Aishera to stay the night refuses to take a suit of holy mithril armor as payment for lodging, explaining that it's worth far too much. Flare, confused, decides to make it worth less by punching it until it's crumpled and riddled with dents. After getting over her initial shock at the sheer stupidity of the gesture, she busts out laughing at Flare's sincerity and ends up exchanging it for 100 gold coins and some new clothes for the girls.
29* ''Manga/JojosBizarreAdventure'':
30** In ''Manga/StardustCrusaders'', Jotaro and Kakyoin [[SchoolUniformsAreTheNewBlack remain in their school uniforms]] for the whole trans-continental trip to Egypt. Jotaro's justification is "We're students, so we should look like students".
31** In ''Manga/DiamondIsUnbreakable'', Josuke finds that one of the enemies that had been tormenting him and his group, Yuya Fungami, was laid up in the hospital with two broken legs from an unrelated motorcycle accident. Fungami appeals to Josuke's sense of honor, saying that [[YouWouldntHitAGuyWithGlasses beating up a man who's already injured would be cowardly]]. Josuke agrees, which is why he discreetly used his Stand Crazy Diamond to heal Fungami to perfect health...and then beats him so badly that he's even ''more'' injured than he was from the motorcycle accident.
32** In the same part, an angry Yukako [[NeverMyFault claims that it's 'the light's fault for turning red' after being yelled at for walking in front of a car]].
33** In ''Manga/GoldenWind'', Guido Mista discuss with his teammates on how people eat herbivores like cows and chickens while avoiding meat from carnivores like cats because the meat from herbivore tastes better. Therefore, human meat would taste terrible because humans eat meat.
34** In ''Manga/SteelBallRun'', Dr. Ferdinand claims that the reason dinosaurs died out was because they didn't respect the enviroment.
35* ''Manga/KaguyaSamaLoveIsWar'': Chika Fujiwara loves using insane justifications to avoid actually dieting as part of her attempts to lose weight. For example, she decided that eating spicy ramen is just as good as exercise, since both activities make you sweat. During the meal she had several dishes of ice cream to help deal with the spiciness, but believes it had no calories since ice cream is cold and calories measure heat. When Yu Ishigami actually crunches the numbers and comments on how many calories her meal had (along with the bubble tea she "treated" herself to afterwards), her response is a straight-faced "Shut up or I'll kill you."
36* In ''Manga/{{Kaiji}}'''s Chinchiro arc, the title character catches foreman Ootsuki cheating [[spoiler:with special dice that only have the numbers 4, 5, and 6]]. Because Kaiji exposed this by [[spoiler:grabbing the bowl [[DidntSeeThatComing while the dice were still rolling]]]], Ootsuki insists that he never completed a roll, therefore he didn't actually use his trick dice, therefore he didn't cheat and should be let off the hook.
37* ''Anime/KillLaKill'':
38** When the tennis club tries to punish Mako for missing practice, Ryuko points out that the reason that she didn't make it to practice is because the AbsurdlyPowerfulStudentCouncil was holding Mako hostage to lure her out. The tennis club captain then counters that she still needs to be punished for getting taken hostage ''without permission'' ([[DisproportionateRetribution said punishment also involves getting stoned to death with tennis balls.]])
39** Mako herself is a master of this, often giving energetic speeches that baffle everyone around her, such as claiming that Ryuko didn't lose the tennis match she didn't even know she was in by claiming that since she rescued her beforehand, she "won at friendship", or telling Ryuko after her initial defeat by Satsuki that she needs to get naked to show off that [[BuxomBeautyStandard she has bigger boobs than her]]. Oddly enough, her conclusion (getting naked) in the above example is right, [[RightForTheWrongReasons even if her reasoning is wrong]].
40* An episode of ''Manga/KimbaTheWhiteLion'' has a PrimaDonnaDirector who's filming a nature documentary use this logic as to why he put a captive orangutan in his documentary, even though [[MisplacedWildlife there are no orangutans in Africa]]. He says that because he and his workers are in Africa and that there's an orangutan (the captive one) right next to them, there are orangutans in Africa.
41* Haruka does this at least twice in ''VisualNovel/LittleBusters''. First, after she's eaten something of Masato's and is called out on it, she makes up a story to frame herself as heroic, in which she received a call from the [=FBI=] warning her of a bomb inside his lunch, which she then ate in order to contain. Then, when she and her friends take to cleaning out the locker room, she makes up a story in which the lockers fall, the school crumbles, the area beneath it turns out to be the home to all the world's dragons, and the planet subsequently explodes, and presents that as a case "not" to clean up.
42* In the first episode of ''Manga/MinamiKe'' [[LittleMissSnarker Chiaki]] uses her own brand of insane troll logic to convince her sister that her classmate's love note is actually a challenge to a fight. And Chiaki's reason for doing this? "He's popular, there's no way he likes Kana."
43** It doesn't sound so insane until you listen to her translation, wherein "I love your cheerful, energetic personality" gets turned into "Hey, you're really noisy and annoying!" and "meet me in the classroom after school" translates into "Let's fight once there's no one there to hinder us." Whether or not Chiaki was being serious or simply cruel is hard to tell...
44** In later episodes, Chiaki uses a new form of insane troll logic to adopt herself a brother (who just so happens to be a girl) simply because their last names are the same.
45** While ''Minami-ke'' is chock full of insane troll logic, Hosaka will always take the cake. Hosaka's brain automatically jumps from "Haruka likes good food" to "I must become the greatest chef ever to impress her." And it only gets worse from there.
46* In ''Anime/MobileSuitGundamCharsCounterattack'', Char decided the best way to [[GreenAesop save the good, green Earth with its beautiful environment from being destroyed]] [[ArtisticLicenseNuclearPhysics would be to throw a whole ton of nukes at it]]. Along with a [[ColonyDrop giant asteroid]].
47** In the original show, Hayato and Kai are so mad that Amuro Ray wasn't executed for desertion that they, wait for it, desert.
48* ''Manga/MyHeroAcademia'':
49** When he finds out that Midoriya actually has a Quirk, Bakugo insists that the former had it all the time and hid it away for a decade just for showing it up at U.A. and [[ItsAllAboutMe mock the latter]]. The idea that Izuku would have used his Quirk to protect himself from [[TheBully Bakugo]] seems to have passed him.
50** Tomura Shigaraki believes (or claims to believe) that because heroes use non-lethal violence in order to stop genocidal villains, then there is no difference between them, and villains will rise to prominence if they kill the strongest heroes. While PoliceBrutality is a real thing to be concerned about, his problem is the "hypocrisy" of violence against violence. All Might notes that it's a bizarre philosophy that looks like it might have merit until you think about it for half a second, and is one of the key reasons that Tomura is labeled a PsychopathicManChild.
51* In chapter 68 of ''Manga/MyMonsterSecret'', [[HelicopterParents Genjirou]] is worried about his daughter, who is having a school trip on the tropical islands. However, because he is a vampire, he [[CannotCrossRunningWater can't just fly over the seas]] to her. His friend Karen then provided a solution: Turn his house into an even more beautiful tropical paradise so his daughter will come home willingly. Even the resident {{troll}} Akane is completely dumbfounded at this idea.
52* In Episode 1 of ''Manga/MysteriousJoker'', Joker pulls this with Hachi by explaining when a "phantom thief" is. He claims that if you let the owner of your [[MacGuffin mark]] know you're coming to steal it, it no longer becomes theft but rather a showdown between you and the owner of the mark. What's more is that Hachi follows with this logic and finds it sound.
53* Gau from ''Manga/NabariNoOu'''s blind trust in Raikou occasionally leads him to make questionable leaps in logic, including his conviction that Kouichi likes glasses so much that he draws them onto his face with magic markers.
54* One of the characters in ''Manga/Oddman11'' has SuperStrength that she explains [[InnocentFanserviceGirl came from being a life-long nudist]]. Her explanation on how the two are related is utterly nonsensical.
55-->'''Nuida''': When you feel someone's gaze on your exposed skin, your muscles contract out of nervousness. [...] Having been completely naked since the day I was born, my muscular strength is now far beyond a normal person's.
56** Much of the early plot of ''Oddman 11'' stems from this sort of logic. Upon learning that Itami has dated all nine Oddmen he's not related to, Setsu's friends suggest that maybe she'll earn the right to date him if she defeats all his exes "like in [[Film/ScottPilgrimVsTheWorld that movie]]." Despite Itami immediately saying that she doesn't have to fight anybody, not only does Setsu take challenging his exes 100% seriously, the Oddmen take her challenges seriously in turn, spending many chapters fighting one another ''based on nothing but an offhand movie reference''. [[spoiler: This hasn't seemed to improve her standing with Itami so far, but it has earned her a yuri harem of the defeated Oddmen.]]
57* ''Franchise/OnePiece'' often has this for comedy but take a look at international laws directed at single individuals the world government pass. If you at one point happened to have had business with, be the child of, or have laid eyes on the wrong person, you might ''retroactively'' find yourself sentenced to death as an unrepentant criminal when he turns out to later become a particularly notorious pirate.
58** Many of Oda's explanations for some of the bizarre happenings in ''Franchise/OnePiece'' run on this, like the reason that Sanji's Diable Jambe (an attack which involves [[PlayingWithFire setting his leg on fire]]) doesn't burn him is because his heart burns hotter, or the reason that Marines are able to wear their coats like capes without them falling off is because they're held on by ''justice'' (and justice will never fall!)
59** The nobles of Goa Kingdom have the Grey Terminal (a city sized landfill of their city's garbage) burned and all its inhabitants killed. They brush off the deaths of everyone there as being "Their fault for being born peasants".
60** A comedic example is Garp, whose idea of turning his pirate-loving grandchildren into strong marines is to have them raised by '''''mountain bandits'''''. The bandits promptly lampshade it.
61** When Luffy asks [[AttentionWhore Cavendish]] to look after Law, Robin, and his other allies while he fights Doflamingo, Cavendish initially protests because he wants to fight Mingo himself. When Luffy reiterates, though, that he's trusting Cavendish to take care of them, the latter agrees to do so...because, by his logic, Luffy trusting him means he also respects him, respect leads to popularity, and popularity results in having fans, and therefore, [[{{Narcissist}} Luffy must be a fan of his]]! And Cavendish can't turn down a request from a fan!
62** [[spoiler: Kaido's child Yamato]] is such a huge fan of Oden that they decided to literally become him, wearing similar clothing, referring to themselves as Oden and deciding to protect Momo because Momo is their "son". A decision that is becomes even more ludicrous than it sounds in execution because physically they are a ''[[BoobBasedGag comically voluptuous]]'' woman. Even Luffy becomes exasperated with [[spoiler: Yamato]]'s "logic".
63---> [[spoiler: '''Yamato''']]: So speaking as Kozuki Oden...I've followed the proper logic that says...as Ace's brother, you should be giving me a ride on your ship.
64---> '''Luffy''': Now hang on! Kozuki Oden's a guy that everyone loves!! There's no way you can be Oden!!
65---> [[spoiler: '''Yamato''']]: Okay fine, maybe you're more Oden then me!!
66---> '''Luffy''': What does that mean, "I'm more Oden"?!
67** From the Enies Lobby arc, the [[TwoMenOneDress three-headed]] Judge Baskerville. His left head wants to punish everyone, while the right head wants to acquit everyone. So the middle head comes up with the "compromise" of '''execution''' every time.
68** A decade before the manga started, Vander Decken IX wanted to marry Princess Shirahoshi for personal benefit, but she was just a child at the time. However, Decken also knew about a treasure held by the royal family, which could be used to induce RapidAging. So he hatched a plan: marry Shirahoshi in order to get access to the treasure, then use it to turn Shirahoshi into an adult, so he could marry her. In the present, even now that Shirahoshi is ''already'' an adult, Decken is still sticking to his plan.
69* Conversed and subverted in ''Literature/RebuildWorld''. The CyberNinja Nelia, InLoveWithTheMark Akira, tells him that she wants him to be her lover in the seconds it will take her to kill him. Akira calls her out on how illogical that is, and keeps bringing it up in the future. The thing is, we learn later that Nelia is a ConsummateProfessional who feels IGaveMyWord about her mission contract, and due to her mission contract demanding that Akira must die to complete it, she basically values keeping her promises over her own feelings.
70* ''Literature/TheRisingOfTheShieldHero'': Deconstructed; the trope manifests itself in the series to simultaneously drive home how full of it Naofumi's antagonists are, and to the point of being blatantly obtrusive and downright hazardous ''because'' their basic reasoning skills are so deeply lacking. His enemies are content with spewing so much bile about him that they outright contradict themselves, calling him a useless coward who can't do anything remotely useful (to the point where he was accused of not only cheating, but ''stealing power from the other heroes'' by certain others when he does go above and beyond) and an evil brainwashing monster trying to take over the whole country (neglecting to acknowledge that if he had any of the abilities they kept accusing him of having, none of them would even have a remote chance of stopping him). The problem is that the people making the insane, baseless accusations and going on them as if they were indisputable fact are people of power and influence, from the other Heroes to members of royalty, whose actions actively wound up hindering not only Naofumi and his attempts to get stronger, but the country's safety at large, and it's not lost on anyone sane (Naofumi himself, his allies, the citizens, and Queen Mirelia herself) that these people are just TooDumbToLive and too LethallyStupid to be looked at as anything but.
71* In episode 8A of ''Manga/SakuraTrick'', Haruka's father said he doesn't want to see Haruka married to "some worthless guy". Haruka took that line to mean he'd be okay with a girl, because a girl is not "a guy". Lampshaded with a note pointing out her error.
72* ''Anime/ScienceNinjaTeamGatchaman'' episode "[[http://www.gatchamania.net/thread.php?threadid=2527&sid= The Gluttonous Monster Ibukuron]]": The Humongous Mech of the title was stealing all the sugar it could grab. [[note]]Sugar is an important resource, fairly easy to get to when the relevant plants are growing, and Katse wants to rule the world.[[/note]] Dr. Nambu's reasoning was, "They're trying to make the children suffer by nabbing the world's sugar." (Subverted in that his secondary theory is "to throw the world into confusion.")
73** The episode became ''Anime/GForceGuardiansOfSpace'', "The Locustoid", and takes the screwy logic up a further notch. Dr. Brighthead (yes, really) says that Gallactor is trying to ''win the loyalty'' of children because, "If your parents couldn't give you sweets, wouldn't you go to someone who could?"
74* ''Manga/SpyXFamily'': While drunk, Yor gets it in her head that because her fake marriage with Loid seems too perfect, she has to kill him to preserve the sham.
75-->'''Yor:''' Ash a normal pershon, I need to murder you sho that nobody dishcovers I'm really a killer.
76* ''StopBullyingMe'': Yuri seems under the impression that being in the school's book club will make people believe he is an honors student.
77* ''Anime/TengenToppaGurrenLagann'' revels in this. In episode 2, Littner Village is attacked by a group of Gunmen. Kamina, being the insane badass he is, determines that, despite seeking shelter being a perfectly viable solution, the only way to survive the attack is to charge head-first at the strongest of the Gunmen and carry out a Gundamjack. It works.
78** Episode 3: Gurren and Lagann are facing Viral's Enki and lose. Kamina's logic determines that the reason Viral defeated them is that Enki has 2 faces (one on the torso, and a head). Next day, they try fighting him again, and deciding that they need to have two faces to stand a chance, Kamina picks up Lagann and slams it right down on top of Gurren. RuleOfCool, this trope and general badassery works together, and the two mecha ''actually combine'', even though it shouldn't.
79** Later, when the moon is about to crash down on the Earth, Nia tells Simon that the chance of saving her is almost 0%. Simon's response: "Well, it's only close to 0%, which means it isn't definitely 0%. That means it's as good as 100% to me!"
80* ''Literature/TheWayToProtectTheFemaleLeadsOlderBrother'': In the original novel, Jeremy Agriche [[VillainousCrush is in love with]] Sylvia Pedelian. However, [[TheDon his father]] has, for unrelated reasons, ordered the kidnapping, torture and eventual murder of Sylvia's beloved older brother, Cassis. Unaware of that, Sylvia searches for Cassis, asking other male characters for help, which makes Jeremy jealous. So, to make Sylvia stop, he reveals to her what happened to her brother, even offering to bring back [[CreepySouvenir Cassis' eyeballs]] to her. Sylvia goes through a massive FreakOut, eventually swearing revenge on all Agriches, all while Jeremy stares at her in [[EvilCannotComprehendGood genuine puzzlement]].
81* Haguro Dou from ''Manga/WolfGuyWolfenCrest'' is a ''very scary'' example of this. Yeah, Haguro -- people don't tend to actively go out and seek out people who want to do harm unto them. Soooooooo, why are you?
82** To make this even more twisted in every possible way, his version of DisproportionateRetribution is drenched in this. Some guy doesn't want you to bug him anymore with your psychotic shenanigans -- and you believe that ''he'' wronged '''''you''''' by "[[AttentionWhore ignoring you]]"? Well, why not settle this unfair dispute by [[spoiler:kidnapping his MoralityChain, then having her chained to a wall and repeatedly gang raped for several hours in front of a camera where you have your object of "obsession" forcefully watch the act proceed as you threaten to release the video to ensure that said ImpliedLoveInterest has her life [[DefiledForever ruined forever]] unless he transforms into a werewolf -- during a time which he can't do so -- [[ItsAllAboutMe just for you]]]]?
83* Keima Katsuragi of ''Manga/TheWorldGodOnlyKnows'' is prone to making huge leaps of logic solely because [[GenreSavvy that's the way things work]] in DatingSim games. Despite having little ground for his beliefs and being perceived as somewhat delusional by his peers, [[BatDeduction he's right more often]] than [[WrongGenreSavvy not]].
84* When baking contest judge Kuroyanagi from ''Manga/YakitateJapan'' marries a girl and divorces her in the span of a few minutes for the sake of a comedic reaction to eating some bread, he gets [[WhatTheHellHero called out on it by Kawaichi]]. Kuroyanagi simply responds that the prefecture the competition is taking place in has the lowest divorce rate in Japan, so more people need to get divorced to raise it closer to the national average. He also counters that compared to the number of times Kawaichi says his CatchPhrase in one day, him getting divorced means nothing.
85-->'''Kuroyanagi''': You only live once, but you can get divorced as many times as you want! Oh how wonderful, divorces!

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