[[quoteright:294:http://static.tvtropes.org/pmwiki/pub/images/Inappropriate_laughter_3024.jpg]]
[[caption-width-right:294:So, how was the funeral?]]

There are some characters who fight for glory, or to [[TheAtoner atone]] for their past deeds. Some of them [[DeathSeeker don't really want to survive]]. Then you've got all the heroic motives - ForGreatJustice, for friends, [[TheCape for society]], the list goes on.

And then you've got this guy.

He'll be right in the thick of the battle, laughing his head off, and genuinely enjoying himself. Whatever the reason, he's simply enjoying the fight. This can be downright creepy.

Like the character who displays DissonantSerenity, the one who pulls off Dissonant Laughter is very definitely at odds with the world around him, although, rather than contrasting chaos with calm, they will contrast the grim battle with their lightheartedness.

The nature of the laugh is not important, either - it can be maniacal, like the LaughingMad, a mildly psychotic chuckle, whatever the character feels like at the time - so long as it's because they're having the time of their lives.

Compare DissonantSerenity and LaughingMad, and consider StepfordSmiler. Can be a characteristic of the BloodKnight. Contrast BerserkerTears.
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!!Examples

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[[folder: Anime and Manga ]]

* There's a lot of this in ''LightNovel/{{Baccano}}'', mostly on the parts of Ladd Russo and his buddies. The most dissonant example comes from Dune, who giggles maniacally as [[spoiler:Claire Stanfield dangles him off the caboose of a moving train and grinds his arm to bits against the tracks]].
* Some of the Extendeds in ''[[Anime/MobileSuitGundamSeed Gundam SEED]]'' and ''[[Anime/MobileSuitGundamSeedDestiny Gundam SEED Destiny]]''.
* [[RealMenWearPink Donquixote Doflamingo]] of ''Manga/OnePiece'' definitely fits the bill here, as he is pretty much always seen laughing, or at least grinning widely, even as he [[PeoplePuppets forces people to fight each other to the death]], among other things. This is cranked up even further during the war with Whitebeard, where he reacts to pretty much everything with psychotic laughter, cementing his role as an AxCrazy.
* ''Manga/SoulEater'''s Franken Stein gets like this at his craziest, notably when facing Medusa, and it's pretty alarming. Even when not at his craziest, he sometimes sports a [[SlasherSmile wide grin]] while beating the crap out of people. And he's a good guy... [[spoiler:on most occasions.]]
* ''Manga/{{Bleach}}'' has consummate BloodKnight Zaraki Kenpachi.
** He only displays this very rarely. Only when his life is in genuine danger from an extremely dangerous foe does he enjoy the fight enough to laugh.
* ''{{Kemonozume}}'' has Ooba who is obviously completely insane but is obviously enjoying himself immensely and is often seen chuckling or laughing like a maniac.
* Whenever [[HigurashiNoNakuKoroNi Shion]] is the "crazy one" she's prone to this. After [[spoiler:she kills Satoko, shortly before remembering Satoshi asking her to protect his little sister, she [[SanitySlippage snaps]] and is laughing even harder. Even while falling off the roof of a building.]]
* Tsuruya of SuzumiyaHaruhi is TheHyena and has laughed, serious or not, for '''everything''', practically.
* [[BloodKnight Scorpio]] [[CombatSadomasochist Kardia]] in ''SaintSeiyaTheLostCanvas''. His opponent [[NobleDemon Wyvern]] [[VillainousValour Rhadamanthys]] is ''not'' amused.
* Shin Kazama does this in the last issue of the ''{{Area 88}}'' manga. [[spoiler: After witnessing the deaths of Saki, Mickey, and Sela, Shin is so emotionally overwhelmed that he starts laughing hysterically. His laughter makes Kim extremely uncomfortable. He returns to his senses when Kanzaki contacts him.]]
* In ''Anime/PuellaMagiMadokaMagica'', Sayaka Miki begins to laugh and smile during her battles [[spoiler: as a result of her effectively becoming a DeathSeeker as she lets her Soul Gem darken. She also giggles insanely during one of her special attacks in the PSP game.]]
* Togepi from ''Anime/{{Pokemon}}'' will often laugh even when things go south. Then again, it's probably just easily excited considering it's a baby.
* In ''Manga/AttackOnTitan'', [[spoiler:Annie]] (usually very stoic) gives off an unsettling laugh and pulls an [[SlasherSmile extremely creepy smile]] when [[spoiler:Mikasa correctly accuses her of being the Female Titan]].

[[/folder]]

[[folder: Comics ]]

* The Joker. In ''Film/TheDarkKnight'', a cop and Batman separately beat him (for different reasons); not only doesn't he fight back, but he's also cackling like a hyena the entire time.
** Also, Franchise/{{Batman}} in ''ComicBook/AllStarBatmanAndRobinTheBoyWonder'' was laughing like a maniac while driving through a bunch of cops.

[[/folder]]

[[folder: Live Action Tv ]]

* Guido Geller from CameraCafe is known for his [[AnnoyingLaugh downright moronic laughter]] (hee-hee), usually when he talks about either old oriental legends, firing someone, or [[BreadEggsMilkSquick the smell of a fried hamster.]]
* The usually straightlaced [[AdamAdamantLives Adam Adamant]] tends to chuckle maniacally when fighting mooks, especially if he's been played in the episode; needless to say, it really creeps his opponents out.
* The ''Series/{{Sherlock}}'' version of Sherlock Holmes isn't one for laughter, but you don't see him happier than when he's on a case.
-->'''John Watson:''' Enjoying yourself? ... I'd drop the smile. Kidnapped kids, remember?
* ''Series/BreakingBad'': The episode ''Crawl Space'' ends with Walt lying on the floor laughing hysterically when he finds out that Skylar gave away the money he needed to to buy new identities for the family, right after Gus Fring had declared his entire family fair game.

[[/folder]]

[[folder: Film ]]

* Baby Face Nelson in ''PublicEnemies'', has to be dragged into the car to stop him laughing and killing people. Earlier, in the robbery in question, he is seen cackling "I GOT ONE!" after gunning down a motorcycle cop.
** A character in ''OBrotherWhereArtThou'' laughs while firing a tommygun. He stops laughing when someone calls him 'Baby Face'. The character is of course Baby Face Nelson. Later after gleefully and manaically robbing a bank, he becomes depressed and wanders off, trailing sad dollar bills behind him. He also laughs and shouts with glee as an angry mob drags him off to the electric chair.
*** The RealLife Baby Face Nelson almost certainly suffered from bipolar disorder (manic depression). And an incident similar to the one seen in the film occurred when the combined Dillinger / Nelson gang robbed the First National Bank in Mason City, Iowa on March 13, 1934.
* In ''Film/FightClub'' Tyler Durden laughs like a maniac while Lou beats the snot out of him.
* In the film adaptation of ''[[Film/TheLordOfTheRings The Two Towers]]'', [[BadassGrandpa Gandalf]] laughs heartily during his BigDamnHeroes moment as he casually beats the [[OhCrap terrified Uruk-Hai]] with his [[SimpleStaff staff]]. [[RuleofCool It was glorious]].
* A notable trait of The Joker in [[Film/TheDarkKnight The Dark Knight]]. During the famous interrogation scene, Batman keeps punching the Joker harder and harder until the Joker just starts laughing hysterically.
-->'''Joker: '''You have nothing. Nothing to threaten me with. Nothing to do with all your strength.
** The same thing happens later when Batman throws him off a building. The Joker laughs like a Disney villain.
*** [[DisneyVillainDeath Won't die]] [[JokerImmunity like one,]] [[SaveTheVillain though.]]
* ''Film/TheRoom'': Mark tells his best friend Johnny a story about a girl he once knew.
-->'''Mark:''' She had a dozen guys. One of them found out about it; beat her up so bad, she ended up in a hospital on Guerrero Street.
-->'''Johnny:''' Ha ha ha. What a story, Mark.
** In ''Literature/TheDisasterArtist'', Greg Sestero (Mark) wrote that the crew was always deeply disturbed by Tommy Wiseau's (Johnny) laughing, but when he was asked to sound more serious, Wiseau instead read the line in CreepyMonotone, making the crew even more uncomfortable.

[[/folder]]

[[folder: Literature ]]

* MikeHammer was this way during UsefulNotes/WW2, as related in ''One Lonely Night''.
-->"You should have seen the way they looked at me; you'd have thought I'd had fangs."
* In the ''Franchise/HarryPotter'' series, Sirius Black does this all the time. Notably, when the wizard police find him in a street full of corpses, and later on when he's [[spoiler:being killed]].
** He wasn't laughing when the wizard police found him. He was weeping so hard it was mistaken for laughter.
*** No, Rowling confirmed on her website that he was laughing.
* In ''Literature/MostlyHarmless'', Ford Prefect [[spoiler: laughs while the earth is being ripped to shreds for the last time.]]
* In ''TheBelgariad'', Mandorallen begins to suffer from phobophobia after he experiences fear for the first time. He's advised that it's normal for brave men to be frightened once in a while, and that he should laugh at his fear to alleviate it. He takes this literally, and makes a habit of laughing out loud while charging into combat, which irritates his companions considerably.
* In ''Literature/TheDresdenFiles'', Harry's psycho fairy godmother, Lea, likes killing. Really, really likes it.
** [[ThePaladin Sanya]] is also described as laughing while in combat, though in his case it may be more of an adrenaline issue than Lea's bloodlust. Or maybe he just really likes smiting evil.
* Ganner Rhysode, a wayward Jedi in the New Jedi Order series, struggled his entire life with his need to be the hero. After being captured by the Yuuzhan Vong and rescued by Jacen Solo, he realizes that playing the hero had always been his greatest weakness, but it could also be his greatest strength. He uses the knowledge of who he truly is to become one with the Force and rushes out to hold off the Yuuzhan Vong warriors, buying Jacen the time he needs to enact his plan. After his badass one-liner of [[YouShallNotPass "None shall pass,"]] Ganner fights and slaughters hordes of Vong warriors...laughing delightedly the whole time.
* Willy Wonka sometimes does this in ''Literature/CharlieAndTheChocolateFactory''; Augustus Gloop's mother is horrified that he's laughing hysterically after Augustus has been carried off to who-knows-where via the pipes, and on the boat ride to the Inventing Room, as it speeds off into a dark tunnel, he's "hooting with laughter" as he explains that "there's no knowing where they're going!"

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[[folder: Theatre ]]

* In ''Theatre/{{Ajax}}'', the protracted torture of sheep is upsetting enough for Ajax's friends and family, but the sheer glee Ajax derives in doing so (thinking he is torturing Odysseus) just makes it worse.
* In ''Theatre/LesMiserables,'' it's common to have Thenardier let off some cackles during the "Dog Eats Dog" number. Considering that he's [[spoiler: gleefully looting the bodies of murdered men, and singing about how the world is [[CrapsackWorld a sack of crap]], he ''definitely'' counts.]]
* In ''PorgyAndBess'', one of the manipulative Sportin' Life's establishing moments occurs when he spends an entire funeral laughing hysterically, much to the disgust of the others in attendance.

[[/folder]]

[[folder: Video Games ]]

* {{Deconstructed}} with Laughing Octopus in ''VideoGame/MetalGearSolid4''. True, she cackles madly during her battle with Snake, but it is revealed that she was captured by enemy soldiers and forced to laugh as she killed people. This drove her insane, and it is implied that she continues laughing to keep from screaming or crying.
* In ''VideoGame/{{Condemned}} 2'' the boss character of the Doll Factory tends to get giggle fits related to this.
* ''VideoGame/SpaceChannel5 Part 2'' has Purge. It doesn't help that in the Japanese version of the game, he's mentally ill to the point of being a PsychopathicManchild along with being a DarkMessiah.
* Many, many [=NPCs=] in ''DarkSouls'' laugh mirthlessly after almost every conversation. It probably has to do with the fact that they are slowly going insane and they know it, and deal with their plight with pitch black sense of humour.
* The Pyro in the videogame TeamFortress2. In the ''[[https://www.youtube.com/watch?v=WUhOnX8qt3I Meet the Pyro]]'' video everybody sees him doing a MenacingStroll while on a murder spree; then we get to see his point of view: He sees himself joyfully skipping in a SugarBowl world laughting and playing with cherubs.
** Also done in [[https://www.youtube.com/watch?v=eFqJjs09CeM ''Crackpot'']] a video for the Saxxy Awards. In the video the Pyro goes killing and mutilating everybody while he believes to be bathing cherubs in a pot (the "cherubs" are body parts).
* Ace Attorney has several Villainous Breakdowns that involve laughter.
** in[[spoiler:Damon Gant's]] breakdown he laughs loudly while clapping.
** [[spoiler:Luke Atmey]] laughs madly when he is caught, followed by a short speech.
** Although it is not seen on screen it was mentioned that [[spoiler:Kristoph Gavin]] laughed after his breakdown.
[[/folder]]

[[folder: Webcomics ]]

* Jagermonsters, of ''Webcomic/GirlGenius'' fame, tend to go into battle with a joyful demeanour. Then again, they're just ''so damn goofy'' that it's hard to think of them as creepy or frightening.
* ''Lackadaisy's'' Freckle does this whenever he gets ahold of a gun. He enjoys shooting people perhaps a bit too much. This is actually why he was rejected from the police.
* BittersweetCandyBowl has this periodically, most notably from Lucy [[spoiler:when Mike throws himself off a cliff to save her, tumbling into the river below in the process.]]

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[[folder: Web Original ]]

* A frickin' [[MoreTeethThanTheOsmondFamily disturbing]] [[http://static.tvtropes.org/pmwiki/pub/images/600px-Red_0509_3444.jpg example]] (which used to be the page image) comes courtesy of Red from ''Roleplay/RubyQuest'' during [[http://evilcorporation.com.br/rubyquest/scene-268.html this scene]]. He has just [[spoiler:pulled down the tarp in the room Ruby woke up in the second time, revealing a stitched-up, bloody body pinned to the wall]].
* Veronica Carter is always doing this. During the final battle, when she was singlehandedly dueling [[BigBad Valentine]] in the middle of an AnyoneCanDie final battle. She was laughing like a child at an amusement park.

[[/folder]]

[[folder: Western Animation ]]

* Blitzwing in his Random persona of ''WesternAnimation/TransformersAnimated'' will laugh at everything no matter what, but he is especially giggly in battle.
* In ''WesternAnimation/HappyTreeFriends'', [[SweetTooth Nutty]] laughs all the time. Sometimes he even laughs as he dies.
* ''WesternAnimation/{{Popeye}}'' and Brutus laugh while they beat the hell out of each other in the 1961 cartoon "It Hurts Only When They Laugh."
** In "Nurse To Meet You" (1945), Popeye is laughing while Bluto beats the hell out of him. That's because all the while the two have been deliberately trying to get hurt so they can be close to nurse Olive Oyl at a hospital, and as a last resort, Popeye force-fed his spinach to Bluto.
* In the ''WesternAnimation/RenAndStimpy'' episode "Powdered Toastman" after saving the Pope, Powdered Toastman beats up Muddy Mudskipper and ties him to the gun powder keg he had tied the Pope to, right as the keg is about to explode Muddy laughs like a maniac.

[[/folder]]

[[folder: Real Life ]]

* At [[http://en.wikipedia.org/wiki/Lizzie_Borden Lizzie Borden's]] double-murder trial, one of the pieces of evidence against her was the maid testifying that, during the interval between Lizzie's stepmother being killed and Lizzie's father coming home and being killed, she had heard Lizzie laughing at the top of a staircase, and a person standing at the top of the staircase would have been able to see into the second floor room and look at the step-mother's body.
* Creator/TennesseeWilliams, no tower of strength when it came to AdaptationDecay (In a toss-up, Elia Kazan chose lightning-charged energy over subtlety every time), got his revenge when the film of ''AStreetcarNamedDesire'' came out. While the rest of the audience would be barking like seals at Blanche [=Dubois=] being committed, Williams was wooping it up in the back row. "Now she's off to the bughouse!"

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