->''Isn't sanity really just a one-trick pony anyway? I mean all you get is one trick, rational thinking, but when you're good and crazy, oooh, oooh, oooh, the sky is the limit!''
-->-- '''WesternAnimation/TheTick'''

The strength of a madman is proverbial, and [[TruthInTelevision with good reason]]. Madness allows people to brush aside the instinctive and conscientious inhibitions that stop the rest of us using our full potential, and perform feats of great strength. Unfortunately, this is also very likely to throw the person right into the prison or the cemetery. [[SuspensionOfDisbelief Obviously]], the same principle will work for supernatural powers. The mad can break through all those barriers meant to keep humans safe, and access their [[SuperpoweredEvilSide true potential]], which would be nice if they weren't stark raving bonkers.

Particularly common forms of this include:

* [[MadMathematician Mad]] [[MadScientist Genius]] - Somehow no longer seeing the world as others has unlocked a brilliance that is far beyond what a sane mind can achieve. Until you apply it to [[IdiotSavant those few select areas]] at least.
** ScienceRelatedMemeticDisorder-- {{Mad Scientist}}s can apply the laws of nature in ways sane scientists could never dream of.
* MadOracle - Unfooled by the illusion of linear time, these prophets see all eternity at once -- and maybe [[PrescienceIsPredictable can't do a thing about it.]]
* FourthWallObserver - Their perception altered to see beyond the borders of their fictional world, these characters have become DangerouslyGenreSavvy.
** It's got to be especially maddening if they realize that they don't exist, but are figments of someone else's imagination. It's a little better if they realize that they are nothing more than a representation inside a massive computer.
* RealityWarper - They force reality itself to reflect their madness, often unconsciously. With mild madness, this can actually be beneficial, but if they are truly deranged [[RealityIsOutToLunch reality starts to crumble]], and {{eldritch abomination}}s flock round.
** MadGod - What happens when a being with godlike power has no concept of limits and unfettered creativity? ''Anything.''
* InsanityImmunity - The minds of the mad are so alien and incoherent, MindControl and [[BrownNote mind-breaking]] spells and psychic powers targeted at conventional human minds simply slide off, letting them see through the {{Masquerade}} and shrug off [[PeoplePuppets would-be puppeteers]].
* UnstoppableRage - Violent mania grants inhuman strength and endurance.

When used for humour, these characters simply live a few notches lower on the realism scale than the world around them.

One form of DeadlyUpgrade and sometimes CharlesAtlasSuperpower. Compare WithGreatPowerComesGreatInsanity (the sister trope), where the power came first, the madness later. Contrast EnlightenmentSuperpowers, where it's a sanity/morality uplifting epiphany that grants power. Do not confuse with CrazyAwesome.
----
!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* In ''Naruto'', inherent power of Uchiha clan (Sharingan) may be activated only in case of suffering ultimate stress and loss so strong, that they break the Uchiha somewhere deep.
** Despite insanity of several jinjurikis, their powers are not born of madness. It is side-effect of hosting a demon.
** As a fan joke, the protagonist of the story is said to use unique mental technique, that is driven by his... dedication to his beliefs.
* In ''Manga/RanmaOneHalf'', Ranma taps into this whenever he uses Nekoken/Cat Fu, which he can only use when his phobia of cats peaks and he becomes convinced that he himself is a cat.
* In ShadowSkill, this caused the StartOfDarkness of FallenHero Kain Phalanx.
* Kaori Sakiyama (you must say her [[FullNameBasis full name, it's a rule]]) in ''Manga/AirMaster''. Little training, yet is a formidable martial artist against anyone except the main character simply due to her insane rage against her lot in life. She has even unlocked special attacks simply because she's that ticked off.
* In ''VisualNovel/FateStayNight'', Berserker class Servants have a Mad Enhancement ability that increases all of their stats by one rank at the cost of their sanity while in use.
* In ''Manga/SoulEater'', Madness is everywhere.
** The madness of the Demon God Ashura not only warped reality around him slightly, but actually was infectious, forcing those near him to see threatening hallucinations and more importantly, if left to run rampant, the madness would blanket the world, driving everyone insane.
** The [[PsychoSerum black blood]] is an even better example. Since Chrona [[spoiler: and Maka]] gain a great deal of power from being insane under its influence.
** Later on in the manga, [[GeckoEnding (the anime didn't get that far)]] Insanity is a full-blown [[AppliedPhlebotinum phlebotinum]]. It is researched and used for attacks, creating [[MonsterClown "clowns"]] from it for additional power boost or protection, etc. The main researcher is Medusa, the creator of above-mentioned [[PsychoSerum black blood]]. She herself is notably {{san|ityHasAdvantages}}e and chastised by rival factions for creating "fake clowns". [[spoiler: Noah]]'s fraction, notably [[spoiler: Justin]], are more about using natural White Clown.
** Later on, [[spoiler: Black*Star and Kid]] both utilize insanity as well, having earned the favor of the EldritchAbomination from the Book of Ebon. They were both already somewhat [[CrazyAwesome crazy]] anyway, so it's a fairly logical step to just go the whole way. Speaking of the Book of Ebon, said EldritchAbomination, the Black Mass, actually represents Madness born of Power.
** All characters make use of the phlebotinum, but Kid is a slightly different instance, seeing as - if one believes the Salvage arc - he's a clone/Soul Jar of a EldritchAbomination ([[spoiler:TheGrimReaper himself]]), who in this universe are (supposedly) incarnations of madness - Madness of Law in his case, foreshadowed by his SuperOCD. Also demonstrated that these beings are susceptible to ''one another'', as Kid reacts badly to both Asura (fear) and the Great Old One (power) inside the book.
*** In the end, though, madness is revealed to be a SuperpoweredEvilSide, that incarnations of concepts like him can use to vastly increase their power and become virtually indestructible, at the small cost of destroying minds of everyone else by just existing. While Ashura, drives people mad with fear, Kid [[spoiler: after assuming his father's mantle]] would have turned them into his mindless puppets of his law, had he succumbed to temptation of using madness as well.
** Stein also makes use of the madness to gain advantage in battle, in his case the madness was always there (increasing since around half of the story), it was just being repressed; in the Battle of the Moon, he releases all his madness in the beginning and then regains control latter in the battle.
* [[spoiler:Maniwa]] in ''Anime/ParanoiaAgent'' becomes utterly convinced he's in touch with another plane of existence. He hears voices, sees things that aren't there, and acts like a superhero. The plot even starts calling him [[SomethingPerson "Radar Man,"]] and [[ThroughTheEyesOfMadness that lunatic may or may not be our last best hope at figuring out]] [[MindScrew what the Hell's really going on.]]
* Espers in ''LightNovel/ACertainMagicalIndex'' gain their powers based on their own warped inner view of the world being so powerful that it actually affects the world around them. When you look at the level fives, it becomes only too clear what this means for a person: At least three of them have committed murder, one is a paranoid mind control user, one's identity is unknown because they never appear anywhere and the last one is convinced that he's a superhero. Only Mikoto Misaka is actually well balanced and normal, making her the poster girl for the level fives by default despite her own personality flaws.
* Unlike other homicidal maniacs in ''Manga/BlackLagoon'', [[spoiler:Roberta]] becomes far more powerful and dangerous when she goes off the deep end, with complicated strategies and maneuvers that lunatics like [[spoiler:Hansel and Gretel]] distinctly lacked.
[[/folder]]

[[folder:Comic Books]]
* This is a common theme in the Franchise/{{Batman}} mythos.
** SelfDemonstrating/TheJoker is sometimes portrayed as being able to see through the FourthWall because of his insanity.
*** In one issue of his own series from the 1970s, the Joker was able to simultaneously fight off both ComicBook/BlackCanary and ComicBook/GreenArrow using a "strength born of madness".
*** In more than one comic, the Joker's madness is presented as a type of superpower; in an Elseworlds comic where every meta was depowered, he was rendered sane.
*** In a Franchise/{{Batman}} / JudgeDredd crossover, Judge Death tried to possess Joker's body but ended going straight through his head and falling out through the other ear.
*** It's also implied in ''VideoGame/BatmanArkhamAsylum'' that the Joker's insanity was the only reason why he retained his mind after [[spoiler:injecting himself with Titan]].
** Franchise/{{Batman}} himself is often shown to possess a form of Power Born of Madness - his obsession with justice is so great that mental powers meant to play on any other trait simply slide off.
* {{Deadpool}} has this.
** Deadpool is an interesting example of both WithGreatPowerComesGreatInsanity AND this. His lunacy is due to having been imbued with superhuman regeneration while suffering from terminal cancer, which means that his brain is constantly rotting away and regenerating back. However, this same insanity grants him several [[BreakingTheFourthWall perks]] that increase his power even further.
* Rorschach from ''ComicBook/{{Watchmen}}'', CaptainErsatz to The Question, is similarly able to do things like [[ImprovisedWeapon fighting off cops with some hairspray and a match]] because he is [[AxCrazy crazy]], [[NietzscheWannabe crazy]], {{Badass}}, and ''[[SerialKiller crazy]]''.
* The deadly threat that [[ThePunisher Frank Castle]] represents is often credited to his psychotic pain threshold and utter lack of inhibition towards hurting people.
* [[TheQuestion The first Question's]] abilities after Steve Ditko consisted of having an odd mask and paranoia. [[CrazyPrepared Lots and lots of paranoia.]] Originally he was just a good detective, fighter and skilled at criminal psychology.
* Peter Milligan's ShadeTheChangingMan is the prime example of the RealityWarper ("forge what you need on the smithy of your soul".) He began merely poetic, and therefore only insane to his native culture, so he was able to survive being flung through the Area of Madness relatively insane. With time on Earth, he got much madder.
* [[Comicbook/IncredibleHulk Hulk's]] rage and anger is shown to be so powerful that not only does it cause UnstoppableRage but also gives him immunity to mind control and other telepathic attacks, often showing him simply shrugging it off. Also Banner's fear of his father coming back from beyond the grave has given him the power to see ghosts, and astral forms.
** The fact the Hulk exists at all may be an example of this. When Banner first got hit by gamma radiation, his various personalities manifested themselves as the Hulks.
** Gamma radiation based powers seem to work like this in general. Gamma radiation brings out everything people suppress (assuming it doesn't just kill them like real radiation poisoning). Depending on what they are suppressing, the resulting transformations can be...unpleasant.
* [[SamAndMax Max's]] mind is so screwed up he's immune to all forms of mind control and hypnosis, has various psychic powers (which mostly served as DeusExMachina or one time gags until ''The Devil's Playhouse'') and awareness of the fourth wall. Granted this awareness is shaky, so is his awareness of his own world.
* Dr. Will Magnus, creator of the MetalMen, does ''[[ScienceRelatedMemeticDisorder crazy]]'' things when he's not on his meds. Specifically, he has bipolar disorder. During his creative highs he's capable of building a superpowerful and destructive robot made of plutonium. During his soul-crushing depressive lows he feels horrible enough to seriously consider activating it.
[[/folder]]

[[folder:Fan Fiction]]
* In the ''Franchise/HarryPotter'' fanfic ''[[http://www.fanfiction.net/s/1604214/1/ Flying Without A Broom]]'', the Death Eaters spike Harry's drink with recreational wizarding drugs, the effects of which are indistinguishable from Harry temporarily losing his mind. The Death Eaters thought it would render Harry helpless, but instead it lets him tap into vast magical powers, powers which he uses to keep himself amused.
* In the ''Bleach'' fanfic FanFic/UninvitedGuests, after the first "arc", Hitsugaya goes insane and decides that the best way to solve his problems is to charge headfirst, alone and with no sort of plan whatsoever into Las Noches and beat the crap out of Aizen. [[spoiler:It works.]]
* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic ''Fanfic/InnerDemons'', when [[FaceHeelTurn Twilight]] [[BigBad Sparkle]] hits her VillainousBreakdown [[spoiler: when [[TheDragon Trixie]] dies in front of her]], it serves as a catalyst for her [[OneWingedAngel transformation into an Alicorn.]]
* Light in the ''Manga/DeathNote'' [[AlternateUniverseFic AU]] ''FanFic/TheFaceless'', since he's still alive [[TraumaCongaLine after everything he's been through]] he determines he must be immortal.
[[/folder]]

[[folder:Film]]
* In the movie version of ''Film/SilentHill'', Alessa's powers are born of overwhelming hatred and despair, which ultimately adds up to madness. Plus, have you SEEN the AbandonedHospital slash BlackBugRoom she calls home!?
* Apparently this is the reason "Howling Mad" Murdock from ''Film/TheATeam'' is recruited in the first place. The movie version of him can make various airborne vehicles perform in ways that defy all laws of physics and decency.
** Murdock appears to be able to fake any foreign accent required (but often just for fun) and speaks Swahili at a customs desk, despite showing no previous knowledge of foreign languages to his teammates or to the audience.
*** He also appears to be immune to electroshock therapy, even enjoying it while the frustrated doctors keep cranking up the voltage to no avail. It takes nothing less than a bullet to the head to make him feel sane ''for a while''.
* [[EvilSorcerer Gallian]] in ''[[DungeonSiege In the Name of the King: A Dungeon Siege Tale]]'' is one of the last magi. He figures out how to be independent from servitude (a magus must serve a king) by naming himself king of the mindless Krugg. He then forges them into a fearless horde that he uses to try to conquer the kingdom of Ehb. He also gains more power by sleeping with Muriella, the daughter of [[JohnRhysDavies Merick]], the king's magus. When confronted by Merick, they converse while dueling with magical swords suspended in mid-air. Merick finally realizes that Gallian has truly gone insane with power. Gallian doesn't deny and shows him exactly what madness can do, even though Merick is the older and more experienced magus.
--> '''Gallian''': You have no idea... how powerful madness can be.
* Insanity seems to be the primary source of physical strength for the antagonists of the ''Franchise/{{Scream}}'' series. In [[Film/{{Scream 2}} the second installment]], even [[spoiler:a middle-aged woman with no sign of physical training]] is able to overpower and kill young men who should be in their prime.
[[/folder]]

[[folder:Literature]]
* In the ''Franchise/StarTrek'' novel, ''Q-Squared'', Trelane is more powerful than his fellow Q because of this.
** In another series of novels, the Q-like entity 0 has gone insane after being locked [[SealedEvilInACan out of the can]] for millennia, and thus has no limits on what he can do. Q specifically invokes this trope by saying, "0's insanity gives him an insane amount of power."
* Big Fido, the [[ThoseWackyNazis Canine Supremacist]] in ''Discworld/MenAtArms''. He's a small poodle, but his madness gives him the power to rip a man to shreds, and cow all the other dogs through sheer force of personality.
** Agness Nitt's split personality allows her to resist mind control. When one personality is dominated, the other takes over.
** Carcer and Jonathon(?) Teatime as well, both psychotic, but it took Vimes and Susan respectively to bring them down.
*** Carcer was, as it were, worse, because he ''wasn't'' psychotic. He'd passed through insanity and circled around to sanity from behind. The thing that made him dangerous was that he had realized that all of society's rules that keep it ticking over nicely only apply to you if you let them. And he didn't want to let them.
*** Vimes fits this himself on those occasions he lets 'the beast' off its leash.
** ''Discworld/ThiefOfTime'' : Excessive sanity as a form of insanity. Jeremy Clockson is [[BlatantLies completely sane]] and has a paper that confirms it (not a lot of people have those). At first [[TheIgor Igor]] has to admit that after working for [[MadScientist Mad Doctor Scoop, Crazed Baron Haha, Screaming Doctor Berserk, Dribbling Doctor Vibes]], and [[AxCrazy Nipsie the Impaler]] "when it came to getting weird things done, sane beat mad hands down" but it eventually becomes clear Clockson's '''''so''''' sane he's gone around the bend and come out the other side. "Stark, staring sane" has to lead somewhere bad... [[spoiler: like nearly ENDING TIME ITSELF.]]
*** From that same book we get Myria LeJean, slightly crazy by ''anyone's'' standards by the end, but I don't think even Susan can match her body-count in [[HumanoidAbomination human-auditors]].
* In the Literature/DoctorWhoNewAdventures novel ''Timewyrm: Exodus'', the Timewyrm tries to possess AdolfHitler and is instead trapped in his mind by his madness. Yes, there's a group of [[StupidJetPackHitler aliens trying to take advantage of this.]] Yes, [[HitlersTimeTravelExemptionAct things go exactly as planned in the end.]]
* In ''JonathanStrangeAndMrNorrell'', Strange takes a PsychoSerum that lets him see one of TheFairFolk so he can learn more magic from it.
* In the ''{{Mistborn}}'' trilogy, by Brandon Sanderson, allomancers come into their powers after Snapping (something like a breakdown after a horrific event) - the most notable being Kelsier, who came into his powers after spending an unidentified amount of time working in a really nasty mine, followed by watching his wife being beaten to death before his eyes.
* Lampshaded at least as early as ''{{Dracula}}'' where Renfield mentions having heard of the strength of madmen, and reasons that as he's mad he must have it. He successfully uses this strength to knock Dracula out of his mist form and, for a moment, get the upper hand in the fight.
* Shiro from the ''Literature/TheAdventuresOfSamuraiCat'' illustrated novels, an 8kg kitten, is able to use a GAU-8 Avenger tank killer [[GatlingGood gatling gun]] due to "the strength of madness".
* From the {{Nightside}}, there is the one known as Madman, who was driven mad by perceiving the truth underlying reality? He's a dangerously powerful RealityWarper whose hallucinations manifest around him. Most notable is that he's accompanied by his own personal soundtrack. The other one is Jessica Sorrow the Unbeliever, who thinks that everything is just her hallucination and everyone is just another voice in her head. Just focusing her unbelief, she can unmake anything.
* In ''This Alien Shore'' by C.S. Friedman, "Outpilot's Syndrome" is paranoia dialed UpToEleven, and those suffering from it require massive amounts of medication to do more than lie around whimpering. However, HyperspaceIsAScaryPlace, so scary that they're merely ProperlyParanoid when in it, so they're the only people who can pilot spaceships through it without getting eaten by {{Eldritch Abomination}}s.
* In ''Literature/OnStrangerTides'', hero Jack Shandy suffers a blow to the head just before confronting an evil sorcerer, who attempts to trap him in illusions. The illusions keep breaking down as a result of Jack's disorientation, causing the villain to exclaim: "What's wrong with your mind? It's like a stripped screw!"
* ''TheDresdenFiles'': [[spoiler: Molly Carpenter]] by ''Ghost Story'', who displays how completely terrifying a master of illusion can be and how fast a newbie can advance if motivated strong enough. Insanely strong.
** In the same story, when told that only truly insane or insanely determined ghosts can make themselves solid, [[spoiler:Harry]] runs over his past exploits ([[spoiler:Zombie T-Rex]] springs to mind) and concludes that he must be one or the other. Which one isn't clear -- but it works.
* In David Brin's ''{{Uplift}}'' series there is a species of client-alien called the Episiarchs, which have been genetically engineered to be so insane that they have the ability to [[RealityWarper alter reality]] by [[IRejectYourReality refusing to accept it]].
[[/folder]]

[[folder:Live Action TV]]
* ''Series/DoctorWho'': The New Who version of the Master.
** As well, Dalek Caan, who managed emergency temporal shift into the Time War, which was supposed to be impenetrable. The process drove him mad, but in the process, he saw [[MadOracle everything.]]
* The reason the Reavers from ''Series/{{Firefly}}'' are so dangerous is more because of them being insanely furious all the freaking time more than anything else.
* Helen Magnus in ''{{Sanctuary}}'' engineers a BatmanGambit to catch a bad guy that involves [[spoiler: pretending to kill a friend and putting a critter in her brain that will make her seem insane to throw off the psychic powers of those meant to determine if she committed the murder since one of them was aforementioned bad guy.]]
* All the protagonists in ''Series/HikoninSentaiAkibaranger'' have this, and it's commonly referred to as "delusion power". The more insane they get, the more capable they become in combat. [[ThroughTheEyesOfMadness Increased delusion power comes at a price...]]
[[/folder]]

[[folder:Professional Wrestling]]
* The only real way to describe Wrestling/{{Boogeyman}}'s quirks, such as his ability to evade and bypass all security measures and the difficulty in getting him to [[NoSell sell]] anything up to and included shards of glass buried in his skin.[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/{{Warhammer 40000}}'': "In the darkness, a blind man is the best guide; in an age of madness, look to the madman to lead the way."
** To be precise, psykers have incredible powers, but as a general rule are batshit insane, to the point that [[BurnTheWitch burning witch]]-erm, psykers, at the stake is in fact a perfectly reasonable and wise precaution. In places where laws of physics go to hell (such as a planet engulfed in a warp storm) sufficiently mad people can become spontaneous reality warpers. And each and every psyker across the galaxy is at constant threat of CREATING one of these places. Every second of the day. Along with breaking the barriers that hold of the entirely omnicidal Powers-that-Be in the package. Along with a horde of daemons. Forget reasonable, it's only because the Imperium is so stringent about shepherding psykers up into the Black Ships that the Imperium's 'only' teetering on the brink of utter annihilation from every named force in the universe. DarkerAndEdgier indeed.
** The various tabletop [=RPGs=] have several mechanics to track your progress: aside from experience, there's also "insanity" and "corruption". In most of the games these are bad things to build up... Except in ''TabletopGame/BlackCrusade'', where more corruption gives you more [[BodyHorror Gifts of the Gods]], but there's no insanity track any more. The assumption is that you ''start the game'' at the maximum of 100 points of Insanity, and it's only by being that off the wall that you even CONSIDER tapping into the kinds of power granted by the [[EldritchAbomination Chaos Gods]].
* In ''TabletopGame/UnknownArmies'', all mages works on this principle. Ritual magic can be done by the sane, for rather wide definitions of sane. The faster and more powerful adept magic, however, can only be powered or cast by individuals who are crazily obsessed with money, books, historic places, alcohol, or danger to the point of that obsession overwriting local reality. A typical bibliomancer, for example, would be so obsessed over books that he or she would cajole or even kill for a given text, and take an assault on the Library as a personal assault. Mechanically, becoming an adept after character creation usually requires five failed Stress checks in a single column and the resulting madness. [=GMs=] are instructed to punish adepts who don't let their character's insanity shine through with drops in power or odd spontaneous magical effects.
* ''TabletopGame/OldWorldOfDarkness'': the Marauders from ''TabletopGame/MageTheAscension''. Something went ''wrong'' during their Awakenings, resulting in them seeing reality through a skewed lens. They are ''extremely'' resistant to the effects of [[WeirdnessCensor Paradox]], which can sometimes slide off them and affect ''any other mages in the area''. If they get crazy enough, they're eventually shunted off into their own pocket dimension in the Umbra.
** The Malkavians in ''TabletopGame/VampireTheMasquerade'' are driven insane the second they are turned, and this very insanity powers their unique ability to cause delusions and hallucinations in others, [[MadOracle as well as see 'patterns' in reality that their saner fellows cannot]]. In the computer game, ''Bloodlines'', Malkavians also get [[DialogueTree different dialogue options]], many of which hint at or warn about future events... albeit in such a confusing manner that you need to finish the game through a sane character first to get all the references. Malkavians are also able to ignore the existence of certain objects rendering them useless against that character, e.g. the machete that did not repeatedly hack into their necks. In games where most of the [=PCs=] are Malkavians, it's more a case of the [=NPCs=] hallucinating the object...
** The [[OurWerewolvesAreDifferent werewolves]] of ''TabletopGame/WerewolfTheApocalypse'' are angry. Angry enough for some to [[ImAHumanitarian cannibalize]] their own species or molest allies to death if they don't keep a lid on it. Angry enough to fuel regeneration or shapeshifting through rage alone.
** In ''TabletopGame/GeniusTheTransgression'', Geniuses wouldn't exist if their mind wasn't influenced by a mental breakdown fueled by discovery. This often leaves them [[TheMadHatter quite mad]]. Consequentially, their Wonders, while not quite as blatantly as the Mages' magic (for example, the sourcebook says that simply putting Mania into a wooden bird won't make it fly just because it's "enchanted"), can bend or break several important laws of physics. And they are quite explicitly ''not science'' as they're non-repeatable phenomena, [[TheyCalledMeMad which leads to...]]
* ''TabletopGame/ChangelingTheLost'' has ''"Beautiful Madness"'' as a theme of the game, and the ongoing challenge of a Changeling's life is to strike a balance between the stolid, dependable order of the mundane world and the ''wonderful'', awful power of the Wyrd. More powerful Changelings are almost guaranteed to be at least a bit crazy - but they can also force the world to play along with their ideas of how it should work. Even the weaker ones can, for example, weave moonlight and daydreams into an invisibility cloak, because it doesn't occur to them that you shouldn't be able to thread a needle with either of those things.
** The Eldritch Order of the Lost Pantheon[[note]](In the ''Lords of Summer'' sourcebook)[[/note]] deserves special mention. Every one of them is very powerful, somewhat insane, and believes to their bones that they are the embodiment of an archetype that determines how they make sense of the world. It works: their madness makes them more perceptive and longer-lived, and gain power from mortal worship.
** The True Fae. Without exception, they have no understanding of objective reality, and define their existence by narrative. While this necessarily includes an AchillesHeel, it can also make them otherwise invulnerable as long as they stick to their story.
*** And, of course, regular Changelings can access some of this power by [[spoiler:raising their own Wyrd high enough, going completely insane, and metamorphosing into True Fae themselves]].
* In the world of ''TabletopGame/{{Exalted}}'', when TheFairFolk use up all their Virtue Channels for one of their Virtues, they enter bedlam, a state of absolute madness. Some Fair Folk charms are made specifically to benefit from this state when it happens.
** There are also a number of Charms for the various types of Exalt that use the madness of the Great Curse to their advantage. For example, Stubborn Boar Defence allows a Solar in Limit Break to ignore unnatural mental influence.
*** It isn't strictly limited to Charms; not fighting Limit Break (which usually translates directly "flow with the crazy") yields in-game advantages, such as a maxed Willpower pool.
* Failing a Madness save in a TabletopGame/{{Ravenloft}} game is usually bad news, but a couple of possible outcomes do provide fringe benefits, e.g. a bonus to Fear saves because you don't think the threat is for real.
** While nearly all darklords have at least some control over their domains' environment, the batshit-insane Easan the Mad cranks this influence UpToEleven, such that the landscape of Vechor shifts with his mood swings and he can physically alter anyone who lives there just by thinking about them. Another insane villain, Davion, causes drastic changes to the village where he lives, every time he swaps between his four personalities.
* In the 3rd Edition of ''DungeonsAndDragons'', a cleric with access to the Madness Domain (offered by Tharizdun and a couple of other evil deities) gains a Insanity Score equal to half his class level. This lets them add this score to his Wisdom Score whenever Wisdom applies to spellcasting. However, it has a disadvantage: for anything else that involves Wisdom he ''subtracts'' the Insanity Score from his Wisdom Score.
** The Madness Domain also gives the cleric the ability to "act with the clarity of true madness", meaning he gains the above benefit to ''any'' roll involving Wisdom, but only once per day (and he must decide to use this effect before making the roll; if it fails anyway, it still counts as used).
** There is also the Tainted Scholar prestige class, which gains more spells and greater spell potency, as well as some other benefits, based on how insane they are. It is considered one of the more powerful prestige classes in the game.
* People known as "The Lost" from the obscure RPG "In Dark Alleys" have such a bad direction sense that ''it defies time and space''. By wandering randomly through streets and corridors they can, in about 15 minutes, get anywhere. The other side of town? They could go there. Another continent? yes. Your baby brother's ''subconscious''? Yes, and they'd probably enjoy it, since most of them are either complete {{Cloud Cuckoo Lander}}s or constantly high/drunk. The same stupidity/clumsiness/insanity also allows them to pull anything out of a bag or pocket. Some people can just casually accept the fact that there could be, say, a hand grenade in their wallet they don't remember ever having put in there.
* ''TabletopGame/DontRestYourHead'', a system where you become more powerful the longer you haven't slept. Indeed, your insomnia grants you "madness powers" which can be used to warp the world around you as you see fit. One of the examples in the sourcebook is the madness power of preparedness, where, if you activate it to a certain degree, you can have "conveniently" happened to have picked up the combination to a vault you are just now getting to. And then there's [[ScarletWitch probability]].
* ''TabletopGame/MagicTheGathering'':
** This is the case for decks built around the keyword abilities Hellbent, Madness (yeah) and, to a lesser extent, Dredge. Sanity is represented by the cards left in your hand and in your library; an empty hand is unstable, an empty library is when a planeswalker is going to completely lose their mind. Madness allows you to sacrifice short-term sanity to play the card you're discarding cheaply; Hellbent denotes cards that gain an advantage when your hand is empty; and Dredge allows you to affect your long-term sanity to recur things from your graveyard.
** The general idea behind the Cabal's dementia magic. Some willingly give in to the madness to attain greater power; only the true masters can maintain their sanity.
* In ''TabletopGame/{{KULT}}'', this is a way to see through the illusion that is our reality. If you proceed long enough, you may become the immortal superbeing every human really is, but you risk to be swallowed by the Achlys.
[[/folder]]

[[folder:Video Games]]
* ''CityOfHeroes'' plays this straight at moments, and subverts it as well. Rularuu's Lanaru aspect broke free of and became powerful enough to frighten Rularuu himself thanks to Lanaru's remarkable insanity. On the other hand, the Clockwork King is undeniably and completely insane, a MadScientist, but one of his particular delusions -- [[spoiler:that he can create working robots out of random junk]] -- ''prevents'' him from realizing his true abilities in our universe.
** [[spoiler: He's actually a godlike psychic, animating every Clockwork in the city like a puppet through the power of his fractured subconscious. Detailed examination of Clockwork reveals that they're just collections of parts that couldn't possibly work, and they don't... they function because [[ClapYourHandsIfYouBelieve the Clockwork King believes they should.]]]] One of the alternate universes you visit in the late game is a world where the King DID understand his true power. [[spoiler: He and his Clockwork are the only ones left alive.]]
* In the ''{{Geneforge}}'' series, serviles aren't able to do magic until the proper Geneforge and canisters are developed. Before then, though, a few serviles would develop the ability to cast spells anyway, [[TrainingFromHell by forming small cults where they could meditate and engage in self-harm]] until they went insane.
* ''TheSuffering'' has some fun with this. The main character has suffered blackouts his whole life, and in-game develops the ability to trigger those blackouts and [[SuperpoweredEvilSide turn into a hideous monster]]. There's a reason this ability is called "Insanity," though--[[spoiler:he doesn't actually change, he just goes into an UnstoppableRage and tears foes apart, hallucinating that it's not really him]].
* From the ''[[VideoGame/TheElderScrollsIVOblivion Oblivion]]'', ''Shivering Isles'' expansion, and less directly in previous releases, there is Sheogorath, [[OddJobGods Daedric Prince of Madness]]. In this case the power isn't born of his madness, but is in fact the primordial essence of madness; Sheogorath himself is essentially just an avatar of a larger, immortal force [[spoiler:which periodically replaces the avatar with another]].
--> '''Sheogorath:''' Now get out of here before I change my mind... or my mind changes me.
* One of the possible character backgrounds in ''"{{Arcanum}}"'', a Victorian Steampunk-meets-high-fantasy RPG, is that you are really an escaped asylum lunatic. Because you are deranged, most people have a lowered initial reaction to your appearance, but you are also so crazy that you take 10% less damage from everything.
* Parsee Mizuhashi, the [[TrollBridge bridge-haunting]] GreenEyedMonster of ''VideoGame/{{Touhou}}: Subterranean Animism'', is explicitly stated in-game to have powers fueled by her jealous rage. There's a reason it's called the "Bridge People No Longer Cross".
* In ''AlphaProtocol'', [[CrazyAwesome Steven Heck]] (''don't'' call him [[BerserkButton "Steve"]]) is one of the world's most talented secret agents. He's also insane. Although never stated outright, there are some suggestions that Steven [[spoiler: doesn't even work for the CIA like he claims, but is just some crazy guy who ''decided'' to become the world's greatest operative on a whim, and now is]].
* ''VideoGame/{{Portal}}'' has Doug Rattman, a programmer at Aperture Science with paranoid schizophrenia who was the only employee that saw [=GLaDOS=] as a serious threat to everyone. His schizophrenia manifested in the CompanionCube talking to him and giving him sound advice as he traversed the Aperture Science testing chambers. When he actually takes his meds, he becomes less capable, even getting clipped by the turrets.
* In the {{No More Heroes}} series, Travis Touchdown is quite out of his mind with the occasional forth wall breaking. It's in the second game that it becomes a power, using his sexual complexes and anger to fuel him in battle and enter super forms, including ''turning into a tiger.'' Being sexually attracted to moe designed characters and having a recently killed friend does some weird things to a man.
* In ''VideoGame/AmericanMcGeesAlice'' it is strongly implied that the reason Alice is able to survive and fight is because she's crazy, despite the fact that her goal is to become sane. Basically, it kept her from being ''completely'' consumed by madness, which the horrors of Wonderland would have quickly done to a lucid person.
* ''[[Videogame/HeroesOfMightAndMagic Might and Magic: Heroes VI]]'' has the Maniacs and the Demented, demons created to act as servants to the Demon Overlord of madness. Their thoughts are so alien to other beings that they are completely immune to mind-affecting spells, and fighting one can be a disconcerting experience, since they howl as though they're in pain whenever they attack someone, and laugh maniacally in response to being attacked.
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[[folder:Webcomics]]
* In {{Drowtales}}, Kiel'ndia Vel'Vlozress, though not as murderously insane as some of her clan members, is decidedly [[CloudCuckooLander whacky]]. She's also the comic's only FourthWallObserver, often addressing the audience directly. (To the rest of the cast, it only makes her look crazier: she is, after all, talking into thin air.) In a remarkable ''{{inversion}}'' of TheFourthWallWillNotProtectYou, she even learns to summon her fans as LivingShadow minions.
* ''[[Webcomic/EightBitTheater 8-Bit Theater]]'' has very many characters that work like this. Let us categorize them:
** Mad Genius: Red Mage, a {{Munchkin}} who believes that the universe runs on Tabletop RPG rules. Considering the fact that he has survived certain death TWICE by not writing down the damage he took it is very well possible that this is true. As far as RM goes, at least... And skeletons are wholly vestigial, anyway. Everyone knows that... However, whenever RM is trying to come up with a plan, as usual completely detached from logic, realism and the fundamental physical laws of the universe, this backfires, because reality doesn't work that way! ... Except when it's [[RuleOfFunny funnier]] [[RealityIsOutToLunch if it does]].
*** At least once, Red Mage tries to invoke this deliberately. Logical plans are flawed, he tells Black Mage, because of their very reliance on logic. A failure at any given step causes the whole plan to fall apart. By formulating a plan that is completely detached from logic, he has actually insulated it against such failure; since no one step actually relates to any of the others, screwing up won't have any effect on the overall plan.
** MadOracle: Sarda is an interesting case of this, since, due to the TimeyWimeyBall, you may or may not say that he may or may not have gotten his [[WithGreatPowerComesGreatInsanity powers before he turned into an]] AxCrazy, [[ComedicSociopathy Sociopathic]] {{Jerkass}}.
*** He also doubles over as something of a MadGod, since he is older than the entire universe itself, borderline omniscient, and is, as mentioned above, an AxCrazy, [[ComedicSociopathy Sociopathic]] {{Jerkass}}... Earth used to have 36 hour days, but Sarda keeps them at 24 hours just to make everyone hurry.
** RealityWarper: Though they probably are more stupid than crazy, both Black Belt and Fighter shows signs of this category. E.g., Black Belt has, due to his NoSenseOfDirection, on numberous occasions altered the space-time continuum in ways that shouldn't be possible. And when their deathtrap of a submarine was filling with water, Fighter was able to return it to normal by pulling out the plug and letting the water drain out.
--->'''Thief:''' I hate it when he makes things that don't make sense ''make sense''.
* ''{{Achewood}}'' features this in the Great Outdoor Fight. Those with Blood of Champions are known for entering fugues which destroy their minds afterward. Ray succumbs to this at first, but gradually channels it into a productive "berserker" state, which according to Roast Beef is the difference between "a lunatic [and] a pissed man with goals[.]"
* ''Webcomic/GirlGenius'' does this with MadScience: Sparks have manic phases where they're deeply intuitive, focused, driven, and scientifically brilliant, although they might forget to eat for days... or, you know, to not be evil.
-->'''Carson von Mekkhan''': In my experience, a strong Heterodyne will take about two hours to ''truly'' warp laws of nature
** There's also a subtle inversion in the fact that while all Sparks go crazy at times, it's actually the ones who can stay in control while "in the madness place" who are the ''most'' dangerous people in the setting, because they can direct and channel their insanity. Baron Wulfenbach, his son Gil, and Agatha, are the best examples.
** When in their zone, they're also shown to pull off physical feats of [[{{Determinator}} determination]]. Even the [[SuperSoldiers Jaegermonsters]] know better than to approach a Spark when they're in their 'MadnessPlace'.
* In [[http://mortifer.smackjeeves.com Mortifer]], the less connections a demon has between his mind and reality, the more of their power they can access (this only applies when they're on earth, though).
* It isn't the main source of his power, but Xykon in ''Webcomic/TheOrderOfTheStick'' definitely seems to be more powerful thanks to being completely mad. Inscribing a symbol of insanity onto a bouncy ball and throwing it into a room full of people isn't the sort of tactic a sane sorcerer would come up with.
* GuildedAge has the Order of the Countless Limbs, an apocalyptic cult that worships EldritchAbomination OldGods dedicated to bringing about TheEndOfTheWorldAsWeKnowIt. They embrace AxCrazy as a ''virtue'' and delight in putting the "chaotic" in AlwaysChaoticEvil. Their higher level clergy can magically infect people with "the Madness", locking them into an UnstoppableRage where they lose the ability to distinguish between friend or foe.
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[[folder:Web Original]]
* MonsterClown and maddest of the [[MadScientist mad scientists]] Rhyme in ''StarHarborNights'' is able to produce feats even other mad scientists can't duplicate (like making helium burn like hydrogen) because she follows "an alternate ordering of the universe"
* DoctorSteel. "Being insane allows me to be who I want to be. There are no longer any rules. I am crazy, and I will become World Emperor. Even if it's simply because I'm ''convinced'' I'm World Emperor." "You can get away with pretty much anything if you're bonkers."
* Over at Roleplay/DCNation, the crazy but lovable Shift swings between this and TheEeyore depending on whether or not his pills have worn off yet. If he's on his pills, he's more of a CloudCuckooLander hero, and if they've worn off, everything is trying to kill him (or at least that's what he says). He might just be [[WithGreatPowerComesGreatInsanity trying to comprehend every single probability at once with a brain that cannot handle the knowledge.]] So the powers cause insanity, and then the insanity fuels the powers...
* Most of the [[Website/ThatGuyWithTheGlasses Channel Awesome]] reviewers believe this applies to [[WebVideo/TheSpoonyExperiment Dr. Insano]] in WebVideo/{{Kickassia}}. First the Nostalgia Critic attempts to get Spoony to let him out, followed by those rebelling against him. Only [[WebVideo/AtopTheFourthWall Linkara]] sees that this [[OnlySaneMan is a dumb idea]], but the others are convinced that you need a madman to stop another madman. Sure enough, Insano gets his ass kicked, although he comes closer to defeating the critic than any other individual rebel.
** Even outside of Kickassia, Dr. Insano seems to be able to invent things that shouldn't work just because he thinks they should, and justifies it with [[ForScience SCIENCE]] ((such as the ability to [[ShockAndAwe shoot lightning out of his hands somehow]]))
* In Literature/{{Worm}}, power is born more from psychological trauma than from madness. In order for a potential parahuman to unlock his/her latent powers, he/she must experience a "trigger" event that causes extreme stress and pushes the person to the breaking point. This may explain why there are more villains than heroes in the Wormverse, and the heroes tend to carry around a lot of psychological baggage.
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[[folder:Western Animation]]
* The TransformersAnimated villain Blitzwing seems to be able to use two elemental weapons and two vehicle modes due to his SplitPersonality. However, it's not completely clear if one causes the other.
** WordOfGod says that the experimentation that turned him into a triple changer made him nutty, not the power itself. Knowing the usual Decepticon [[PlayingWithSyringes "research process"]], it's hardly surprising.
** Though it's worth noting that while his "German Pilot" personality can only use the plane form and ice weapons and the "Schwarzenegger" personality can only use fire and the tank form, the "Nutty" persona can use '''''all''''' his abilities at will.
*** The personalities are named [[AnIcePerson Icy]], [[PlayingWithFire Hothead]], and [[AxCrazy Random]]. As stated above, Random has access to all of Blitzwing's forms and abilities, but it's balanced by [[CrazyAwesome Random's tendancies to sing nursery rhymes or go off on tangents about servo salad.]]
**** [[AxeCrazy Less balanced out]] when you take the whole iron filings and servo salad quote. Transformers use [[HoldYourHippogriffs machine versions of phrases a human might say]], ''especially'' when it comes to parts of the body. You should probably replace "iron filings" with "skin shavings" and "servo" with "hand and arm". To put it simply, [[ImAHumanitarian that]] is pretty [[ThisIsWrongOnSoManyLevels screwed up]].
--> '''Blitzwing''': Ooh, but I LIKE iron filings! Especially sprinkled on top of servo salad!
* A lot of the stuff {{Freakazoid}} pulls off (on a disturbingly regular basis) suggest that his comic psychosis is actually the source of his power, not [[WithGreatPowerComesGreatInsanity the other way around]].
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** Nightmare Moon seemed to be this - at least Princess Luna seemed much weaker once she'd regained her sanity. However, when she returned in the second season, we find out that she is in fact so powerful as herself that she can be destructive ''without meaning it'' if she doesn't work to keep a lid on her godlike powers. She seems more powerful than her sister because she is less restrained, and of course being ''evil'' is the logical extension of this.
** [[CloudCuckooLander Pinkie Pie]] is this to a T. She's so preoccupied with hopping around, singing random songs out of nowhere, and throwing parties, that she never seems to realize she's [[RealityWarper breaking the laws of time and space as she does it]], and on numerous occasions completely freaking out her friends as she does it.
---> '''Rainbow Dash:''' (After watching Pinkie Pie slow her descent mid-air to avoid a splash) How did you do that?
---> '''Pinkie Pie:''' Just trying to show a little consideration for my sleepy friend.
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[[folder:Real Life]]
* Viking berskers demonstrated this trope. They would fly into [[UnstoppableRage violent psychotic rages]] that would essentially remove the brain's natural limiters on their muscles, increasing their raw strength several times over, granting them what resembled superhuman strength (remember that these were men who ''ordinarily'' could row a longship for hours or days, and then still put on chain armor and pick up a shield and war-axe and fight, and were just flat-out bigger than a lot of European peoples) and grant them an immunity to pain (the adrenaline and anger would block it out), making them resemble [[TheJuggernaut super-human engines of destruction.]] There is some debate over whether or not these rages were induced by hallucinogens or just a natural tendency of the people to get ''really really'' pissed. [[TakeAThirdOption Or both.]]
** These rages have also been said to make them immune to "blade and fire", which holds up at least somewhat: while both of those things hurt a lot and can kill you, in most cases (barring decapitations and other [[OneHitKO instant kills]]) it's really the pain that puts you down in the short term--and as stated above, pain is sort of a secondary concern for someone in a berserking rage--so blunt weapons are more effective, as the injuries caused by them tend to actually break the machinery of the body rather than just hurt a lot.
** The legendarily bad-tempered Egil Skalla-Grimsson was an example of a Norse warrior who really did fly into a rage over nothing. He has recently been determined to have had Paget's disease. This disorder causes the bones to become very thick and strong, but also causes circulation problems, deafness, blindness, and various minor deformities. Quite significantly, it also causes chronic pain that prevents the victim from sleeping properly, ensuring a chronic bad temper.
* [[http://en.wikipedia.org/wiki/Creativity_and_mental_illness Quite a bit of real world evidence]] actually supports a correlation between extreme intelligence/creativity and mental illness.
** Mental breakdowns of varying degrees are unusually common among [[MadMathematician pioneers of mathematics]], some apparently driven [[GoMadFromTheRevelation insane]] by endless calculations in [[AcidTripDimension hypothetical]] [[HyperspaceIsAScaryPlace hyperdimentional]] [[AlienGeometries non-linear systems]] while others [[ABeautifulMind begin a bit off from the start]], which [[BlessedWithSuck may actually contribute to being able to deal with]] high level mathematics in the first place.
** MadArtist. That is all.
** While definitely the exception rather than the rule in real life, there have been an undeniable number of individuals worthy of the title of MadScientist, and, yes, even EvilGenius- simply check the real life section of the respective pages. In science as in math, sometimes a [[TheCuckoolanderWasRight novel approach]] leads to a novel discovery, and more than a few [[TheyCalledMeMad discoveries]] have been achieved in [[http://en.wikipedia.org/wiki/Anatomy_murder ethically questionable circumstances]]
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