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Anime & Manga
- In Steins;Gate basically every time Hououin Kyoma enters the scene, though it's actually just an act.
- Suzaku Kururugi does this in episode 19 of season 2 of Code Geass after accidentally killing several million people with the FLEIJA bomb. This led to the creation of several Fan Nicknames, namely Laughzaku and LOLzaku. Sometimes Lulzaku is used.
- Lelouch does this as well at the end of episode 17 in the first season. He has other laughs too, but that's the only one that actually sounds legitimately crazy.
- In YuYu Hakusho, after being defeated and losing his entire fortune, Tarukane goes into convulsions of insane laughter, which only end after Toguro kills him.
- Shaman King's Big Bad, Hao Asakura does this near the end of the anime.
- In Azumanga Daioh, after a Beach Episode and everyone's back to school, quote Tomo: "this is the first day of vacation" repeating it like a mantra, following a Butthead-like laughter.
- Appears in the series and film The Vision of Escaflowne, especially with Ax-Crazy Dilandau.
- Franken Fran: Mr. Umimiya appears on the verge of a laughing nervous breakdown upon discovering his long lost daughter Ruri's (whom a maniacal cult worshipped as their prophet) body had become a part of the facility they're standing in due to the cult requesting Fran that she create an enormous artificial body when she fell ill.
- Higurashi: When They Cry. All over the freaking place.
- In fact, the first thing you see in the second arc, even before the opening, is a scene of Rika stabbing herself in the neck while Shion laughs maniacally. It then takes about 10 episodes before you're finally told the context, and that makes it even creepier.
- For your viewing pleasure, some YouTube Poop of Shion laughing...for ten minutes.
- In the intro of Paranoia Agent, everyone is laughing. In the most unlikely situations, such as a guy in freefall, a drowning woman... what better way to tell you're about to get mindscrewed?
- Kotonoha from School Days does this frequently after her descent into crazyville.
- Precia Testarossa in Magical Girl Lyrical Nanoha, although she was fairly mad to begin with.
- Jail Scaglietti does it frequently.
- Puella Magi Madoka Magica: Sayaka goes a bit nuts on Elsa Maria in a nightmarish scene that shows just how close the poor girl is to the Despair Event Horizon. It doesn't help that the witch superficially looks like her love rival, Hitomi.
- Not to mention Walpurgisnacht...
- Quatre from Mobile Suit Gundam Wing after witnessing the deaths of his father and most likely his sister Iria (it's only confirmed in the manga version of the scene).
- Death Note anyone?
- Also, the deleted scene where Light stays in the graveyard after L's funeral, starts laughing madly, proceeds to crawl on top of L's grave and shouts "What do you think of that, L? This is my perfect victory! That's right—I win!" with a crazed look on his face... and looks suspiciously like he's humping L's grave.
- While he's sane afterward, the new Greed of Fullmetal Alchemist Ling is shown ending his Painful Transformation with a frightening Slasher Smile and some truly maniacal laughter.
- Edward has one after he realizes that trying to resurrect Trisha was a Senseless Sacrifice.
- Alucard of Hellsing certainly enjoys many inappropriate moments of insane laughter...but as he was crazy before, and is crazy after, the incidents don't represent any character development for him.
- Hikari of Space Pirate Mito: A Pair of Queens.
- Full Metal Panic!. Kaname has a crazy laugh that she gives whenever she's lying about something — such as the possibility of being attracted to that nutcase Sōsuke. Or denying that his latest bone-headed antic bothers her in the least. Be afraid. Be very afraid.
- Yoko Wakana, the mad policewoman from Full Metal Panic? Fumoffu, plays the trope straight.
- In Barefoot Gen, Gen's mother Kimie falls into this. It's quite appropriate after watching her entire family burn to death amongst their pleas for help.
- Doctor Franken Stein of Soul Eater does this on several occasions. Definitely the Sanity Slippage variety.
- The most striking would have to be after his fight with Medusa, with Stein breaking into a lovely example as stands with his scythe as the witch's blood rains down on him. Madness, apparently, feels good.
- Anyone under the influence of the Black Blood would do this. Crona and Maka are examples.
- Giriko does one in chapter 75.
- Uchiha Sasuke from Naruto has an epic one in chapter 483, coupled with Sanity Slippage and Villainous Breakdown in a fashion very similar to his brother.
- Not to mention Hidan of the Akatsuki. This guy wasn't sane to begin with, but once he gets into his rituals...
- Gaara has a great one during his fight with Naruto.
- In chapter 356, Kabuto has lost quite a bit of sanity following Orochimaru's death and reveals he has absorbed Orochimaru's remains. At one point he bursts into hysterical laughter.
- In chapter 577 Kabuto does this after talking with the resurrected Itachi.
- Andrea of Gankutsuou is not exactly sane. One of the ways he shows this is by giggling/laughing creepily at random times.
- In one scene, the Count watches Albert leave his ship, quite peeved with him. Although we're led to presume that the guy is deep in grief over the event, we quickly see him break out into hysterical laughter. And from then on, he's out there, madly pursuing his revenge.
- Ax-Crazy Creepy Child Gretel of Black Lagoon laughs once when Eda asks her why they're still after Balalaika even though they killed the guy who hired them.
- GUN×SWORD: Van gets this for a moment when he sees the Claw pass.
- Mukuro of Katekyo Hitman Reborn! was never entirely sane to begin with so he does this a few times, most notably during his fight with Tsuna.
- And Daemon Spade. In chapter 329 he orders Enma to "take Sawada's skull and crush it like glass", and then he laughs maniacally...
- Grimmjow of Bleach laughs madly as he's beating the crap out of Ichigo during one of their fights and right after he kills Luppi.
- Mad Scientist Szayel does so at times.
- The Inner Hollow/Zangetsu also does this often.
- Future Diary: Yuno does this quite a few times.
- Alois Trancy of Black Butler II out of nowhere breaks into hysterical laughter when he's alone in his room in episode 1 to help show how insane he is.
- On the other side of the spectrum, Ciel gives us an absolutely geelful one after the circus arc, when he travels to the workhouse only to find out that it's in ruins. It's frightening in context, considering that the revelation would mean that the circus children all died trying to protect nothing.
- Dragon Ball Z:
- Broly definitely applies, especially in the flashbacks where it is clear that his laughter was uncontrollable after destroying at least one planet as a child.
- Frieza also gives one off while destroying Planet Vegeta. Well, he did seem a bit too exhilerated at blocking Bardock's attack as well as destroying Planet Vegeta.
- Majin Buu in his true, Kid Buu form. Kid Buu is, by a significant margin, the batshit-craziest of the Buus, and pretty much 95% of his dialogue is either grunts/screams or deranged laughter to show just how far off his rocker he is.
- Yu-Gi-Oh! has its fair share, most notably with Yami Marik and Bakura, although Kiryu of 5Ds outdoes them all.
- And then Vector of ZEXAL proceeds to outdo him.
- It's not just with those guys, either—Noah had an insane bit of laughter like this in his arc, after which he temporarily believed himself to be Seto. He snapped out of it pretty quickly, though.
- Jonouchi laughs hysterically (After being Brainwashed by Marik) at an injured Yugi during their Death-Duel. however this is cut from the 4kids version...For some unknown reason.
- Pandora (Arkana in the dub), and how!
- Nanamine in Bakuman。 after his manga drops to 19th and the rest of his online contributors desert him for lying about his rankings.
- One Piece:
- Monkey D. Luffy does this the moment after Portgas D. Ace dies.
- Donquixote Doflamingo is pretty much this series' version of The Joker, so he's usually this. But it's most obvious in the Dressrosa arc, when he turns from recurring sideline psycho to the main antagonist, after finding out just how severely he underestimated the Straw Hat Pirates.
- Occurs occasionally in Pandora Hearts such as in chapter 67 by Miranda. And in episode 15 by Oz when he's in Love Makes You Crazy mode for Alice.
- In Wolf Guy - Wolfen Crest Inugami shows Haguro his werewolf form causing him to go crazy from it and laugh insanely.
- Ryuuko does this in chapter 65.
- Akito does this in episode 25 of Fruits Basket while tormenting Tohru.
- Akito also has a tendency to do this in the manga.
- Rosario + Vampire: Tsukune's Ghoul form definitely counts.
- Akuha does so at the end of chapter 53 after breaking down and seeing Moka with Tsukune.
- Berserk, with all of the madness that happens in this universe, expect it to happen a lot.
- Jill laughs during the climax of the fight between Guts and Rosine, when the slimy, deformed corpse of a child that was undergoing Rosine's apostle spawn transform spilled from its cocoon. Jill remarked that the experience pretty much ruined her childhood.
- Griffith, upon his Despair Event Horizon and his failed attempted at suicide.
- And then there's Guts, who is the most disturbing case. He did this a lot during his Black Swordsman days, caving in deeper and deeper into insanity with each apostle kill. His laugh sends extra chills down the spine when he flashes his Slasher Smile afterward.
- Peacemaker Kurogane: Suzu gets one of these in the sequel manga, after he goes Ax-Crazy.
- In Princess Knight, when Friebe finds out that the brave knight she planned on marrying was really a princess in disguise, she bursts out laughing and shouts "That's too perfect!" She pulls herself together and agrees to help the princess escape her pursuers.
- Shishio Makoto does this as he burns to ashes after overdoing in his final battle against Kenshin.
- Jeremy when he finds out that Greg's car crashed thanks to Vehicular Sabotage and when he is moved dorms because he kissed his roommate William. He laughs because he finds it ironic that he gets in trouble for kissing his roommate, yet he is sexually abused every weekend which leads William to Get a Hold of Yourself, Man! in A Cruel God Reigns.
- Mad Pierrot Tongpu, full stop. A seemingly indestructible psychopathic assassin. The audio for the preview for his episode is just his maniacal laughter for 30 seconds.
- In a very jarring scene, Annie Leonhart in Attack on Titan after The Reveal. The Slasher Smile included along with it only signals that things are about to get very bad for everyone.
- In the penultimate issue of the Area 88 manga, Shin emotionally overwhelmed by the deaths of Saki, Mickey, and Sela that he starts laughing uncontrollably. He returns to his senses when Kanzaki contacts him.
- Kurumi Tokisaki from Date A Live does this several times, such as summoning a second spacequake before Kotori in her Spirit form stops it.
- Tokyo Ghoul includes a particularly disturbing scene, during Kaneki's 10-day long marathon torture. When Yamori sticks a centipede in his ear and wraps duct tape around his head, Kaneki begins laughing hysterically while the agitated insect begins crawling around and stinging him. Seeing his victim laughing instead of screaming, Yamori joins him into the crazed laughter.
- Eto does this as she's declaring her love for Kaneki as he throws her mutilated body off of a building.
- Mutsuki breaks down into hysterical laughter, after seeing Torso's mutilated body done at his hands and realizing the full scale of his past crimes.
- Kaneki does this again in season 2 of the anime when fighting Shinohara in his kakuja form.
- Both Mashiro and Kuroi from Thou Shalt Not Die end up doing this but for different reasons. Mashiro ends up doing it when her day ends up a bit to rotten and she ends up snapping after being shot. Kuroi ends up doing it since he delights in the carnage Mashiro is causing leading him call out that he was right in believing in her and ends up declaring his love to her.
- Akira Takaoka from Assassination Classroom breaks into a fit of hysterical laughter when he blows up the remedy to cure the students who were poisoned by him during the Assassination Island arc, further pissing off Nagisa.
- Zatch Bell!: Dalia Anjé, a somewhat notable antagonist from the Ancient Mamodo arc. The spells are her only dialog; beyond that, it's just mad laughter.
- This is generally how Batman's enemy The Joker is portrayed as going insane. Upon seeing his new, ghastly appearance, he laughs uncontrollably while clutching his hair in anguish. The Joker is also frequently shown laughing excessively long after he's gone mad.
- A flashback in The Sandman shows this happening to Delight during her transformation into Delirium.
- In a flashback to the future, Hobgoblin 2211, after having her brain warped by a computer virus, cackles psychotically and goes on a rampage.
- The Green Goblin has shades of this, and the current Hobgoblin has a weaponized laugh seeing as he's Phil Ulrich.
- In the Jackie Chan Adventures and W.I.T.C.H. crossover fanfic Kage (part of Project Dark Jade), Drago does this during his Villainous Breakdown, starting when he casts the spell to cast Jade from her reality (as part of his being a Sore Loser, he wanted to taint her victory, as he considered her his Arch-Enemy), and continuing even as he and and his father are dragged into their prison.
- Hago from The Lion King Adventures is in love with this trope.
- In the Harry Potter Dark Fic The Jaded Eyes Series Harry does this on a couple of occasions. The most notable one is his Villainous Breakdown when he snaps during the Yule ball:
He stood in the middle of it all in a puddle of blood as more poured down his front and it was almost ironic that a few heartbeats later Harry was hit by another stray curse. Clark had joined the fray with his mother and luckily his jinx was almost harmless. It only banished the top part of his clothes away and that was when Harry started shaking. In the end it wasn't the teachers that stopped the chaos building inside the ballroom... it was the sound of sharp cold laughter.
It pulled everyone's attention as they turned their eyes to Harry who stood bleeding with a star burst wound on his chest blood flowing from him steadily as he laughed. Harry laughed harshly with no humor as he raised a shaking hand to his face inspecting the blood painted on it before he fisted his hair with both hands and cackled brokenly. Blood was smeared across his face; he was covered in spatters of blood giving him a ghastly image. The cool rush of the air reminded him that now most of his worst scars were on display and made him cackle harder.
- In New Game Plus, when Dadan sees Luffy’s record-breaking bounty poster, she falls into a laughing fit that lasts at least 10 minutes.
- Twilight Sparkle in Pages Of Harmony does this several times, one of the more notable ones from Chapter 11 when she's bleeding from wounds caused by an Ax-Crazy Fluttershy after Kindness has been taken.
"Ha, I'm no masochist, my friend!" Twilight was shaking her head in response to the other pony's inquiry, gasping for breath from her half-shrieks. "Heheh, haven't you heard that, hahaha, laughter a way to trick your body into, haha, not feeling pain?!" Her smile widened as she managed to dodge Fluttershy's frenzied attacks, angling herself to more easily control the blood flow from her wound. "Heheheh, that's why I laugh, Fluttershy! It enhances me! I sill feel pain, but, heheheh, it's not enough to kill me!" Her eyes were bright despite the obvious pain in her body, practically drunk with the imagined extent of her plan and the laughter which accompanied it. "Imagining helps too, just as I'm doing now, ha, thinking of just how existence will be when I've helped purify it under my guidance as a good friend and teacher! HahahahaHA!"
- Sunset Of Time, in a flashback we see the Start of Darkness of the Big Bad, Vesper Radiance. At the sight of Twilight's coronation, she breaks down first into giggles, then into hysterical laughter, declaring her intent to Kill 'em All all the while.
- This Bites!: Self-Inserted character Jeremiah Cross becomes this whenever things get dangerous; that is, when his adrenaline junkie tendencies kick in.
- In the Miraculous Ladybug fic I Do?, this is one of several reactions from Adrien/Chat Noir after he finally realises that his (until recently) fiance Marinette and his crime-fighting partner Ladybug who he once had an unrequited crush on are the same person.
He didn't even know he was laughing until he was doubled over and falling to his knees. The crack that was sent through his body as he collided with the roof hardly registered, his stomach still wanting to throw itself up as his laughter grew manic.But perhaps laughter wasn't the right word to use. He wasn't sure there was a word for it. Insane cackling, maybe, accented by sobs and tears that tore him in the same moments. Two conflicting actions that felt as though they were ripping his body apart.A mental breakdown. That was what it was. He was having a mental breakdown.Because the two women he'd loved were the same person, and she'd rejected him twice for himself and he'd fallen in love with her twice and now they were standing on a rooftop after she'd abandoned him at the altar for himself!
- Doing It Right This Time: Shinji has this reaction when he finds out what Rei said to his father, and again when she snarks (accurately) about how them being time travellers and being completely mad is not at all mutually exclusive. Asuka is more than a little creeped out.
Films — Animation
- Disney Animated Canon:
- The Lion King has The Hyena, Ed, who communicates entirely with obnoxious laughter. Banzai and Shenzi also qualify, but to a lot lesser extent. Cancelled storyboards indicated that Scar would have undergone a heavy dose of Laughing Mad shortly after throwing Simba off Pride Rock before being consumed in the flames that destroy Pride Rock.
- It was also originally intended that Gaston from Beauty and the Beast would have undergone similar reactions to The Joker from The Dark Knight when falling to his doom upon stabbing the Beast (ie, proceed to laugh maniacally while falling).
- Vanessa, the disguise for Ursula in The Little Mermaid, started laughing frequently and somewhat dementedly while gloating about her inevitable victory, indicating that the transformation process costed her quite a bit of her sanity.
- In The Hunchback of Notre Dame, Frollo laughs evilly as he goes to stab Esmeralda with his sword. Given that his next line suggests he thinks he's doing God's will ("And he will strike down the wicked, and cast them into a fiery pit!"), it's pretty likely he'd also gone mad with power.
- Subverted when Jafar starts laughing for seemingly no reason while he's being searched for by the guards, causing Iago to think he's gone insane, but then he stops and explains that the genie lamp he thought was Lost Forever was in the hands of "Prince Ali."
- Played straight by Jafar during the Prince Ali Reprise.
- Buzz Lightyear in Toy Story does this after realizing he's just a toy. ("You see this hat? I am Mrs. Nesbitt!") He stops after Woody slaps him with his own detached arm.
- Done by the fowl villain Nigel (pun intended) in Rio, a bitter and sadistic cockatoo whose replacement in a popular animal show by a green parakeet caused him to develop a deep hatred against all exotic birds. He lets out a maniacal laugh after his Villain Song "Pretty Bird."
- In Firing Range, a general start laughing madly after realizing he can't stop the tank from killing him.
Films — Live-Action
- Richard Attenborough's character in The Flight of the Phoenix (1965) when he discovers that the man building the plane to take them out of the desert, and save them from slow and painful death, only has experience designing model airplanes.
- Norman Bates occasionally laughs at inappropriate points during his dinner with Marion in Psycho. He also lurches from laughter to complete seriousness a couple of times, which is equally scary. Downplayed in that it's a nervous chuckle rather than a full-lunged hysterical laugh.
- Sirius Black, when convicted of killing Pettigrew in the movie of Harry Potter and the Prisoner of Azkaban.
- And then once again in the film version when Harry is set on killing him. This is a strong contrast to the book's character: "You're going to kill me, Harry?"
- Beyond Re-Animator: After Philip's girlfriend is murdered, Dr. Herbert West brings her back to life by infusing her with the lifeforce of the corrupt warden who killed her along with his previously developed reagent so she can retain her memories, skills, and motor functions as a zombie. Unfortunately she comes back as a kinky crazed and dangerous zombie and Philip is forced to incapacitate by cutting off her head. When the guards find Philip weeping over her headless corpse, they drag him away as he tries to convince them that she is still alive by urging her and her headless body to speak to them. When she doesn't respond, he goes into a fit of insane laughter and then when he and the guards are out of sight, her head starts laughing and thus the movie ends.
- In many Hamlet adaptations Ophelia's madness is like that: she switches between sadness (tears) and moments of happiness (insane laughter).
- Happens to Dr. Leo Marvin in What About Bob??
- In the 1932 film The Mummy (1932), after Ralph Norton sees the eponymous creature rise from its tomb and walk off, he is found giggling insanely and gibbering "he went for a little walk!"
- Dwight Frye's Renfield in the 1931 Dracula.
- The Evil Dead series is quite fond of this trope.
- Cody Jarrett winds up this way in White Heat.
- Chief Inspector Dreyfus in The Pink Panther Strikes Again has a small bit of this after being "saved" by Clouseau on the day of his sanity hearing, triggering his escape from the asylum and sending him on a course to try to Take Over the World.
- Insurance fraud investigator John Trent punctuates his snapping mind with laughter at the end of In the Mouth of Madness, due to surviving a Lovecraftian apocalypse, only to witness the entirety of his ordeal play out as a movie adaptation of an evil novel.
- The "Daffy" gremlin in Gremlins 2: The New Batch.
- Baron Vladimir Harkonnen in the 1984 film adaptation of Dune definitely qualifies, given how the film basically made him even more deranged in it than in the book or the TV miniseries.
- The Joker from The Dark Knight embodies this trope. Heck, he was even laughing when about to face certain doom before Batman saved him from hitting the ground.
- In the 1989 Batman film, the Joker laughs a lot during the film, with him going way off the deep end near the climax when he is taunting Batman and Vicki while they are hanging for dear life. Joker even lampshades it in the same climax, where he goes into a fit of laughter, turns to a gargoyle behind him and yells "What're you laughing at?!" and then resumes laughing.
- Austin Powers in Goldmember had Dr. Evil dunking the Japanese Corrupt Corporate Executive Mr. Roboto into his "sharks with lasers on their head", which were gifts from his son Scott Evil. Although Dr. Evil and his followers did a simple Evil Laugh, Scott Evil's laughter, as well as Dr. Evil's horrified reaction to Scott Evil's amount of laughter, was more similar to Laughing Mad.
- After a long and miserable afternoon watching his dream home literally go to pieces on him, Walter and his fiancée Anna in The Money Pit try to prepare a relaxing bath, only to have the tub sink through the floor and shatter into smithereens in the foyer below. Walter's reaction is both a sterling example of this trope, and one of the funniest parts in the movie.
- Data in Star Trek: Generations briefly goes laughing mad while attempting to investigate with Geordi the space station that Dr. Soren was working on, due to a combination of both the dampening field in place as well as Data's emotion chip going beyond his control.
- Who Framed Roger Rabbit has the weasel Psycho, who giggles and laughs a lot.
- In 8 Heads In A Duffel Bag, one of the main character's best friends goes exactly this kind of crazy after having been tortured by a Mafia hitman, repeatedly told he's going to be killed, and forced to cut off the heads of cryogenically frozen people as replacements for the missing ones, among various other extremely stressful events. The final straw was when the aforementioned hit man started talking about using his head as one of the replacements. He spends the rest of the movie getting worse
- In Donnie Darko, Donnie laughs hysterically when he finally comes to terms with the fact that he's going to die and is waiting to be crushed by the airplane turbine.
- In the film adaptation of The Wizard of Oz, the Wicked Witch of the West frequently bursts into hysterical, exhilarated laughter whenever pain and suffering caused by her is happening.
- In Eye for an Eye, Karen McCann starts laughing hysterically during her daughter Julie's funeral.
- In the 1951 Scrooge (1951), when Scrooge wakes up on Christmas morning and can't stop laughing out of joy, his housekeeper thinks, justifiably, that he's gone quite mad.
- The Adventures of Priscilla, Queen of the Desert: Adam/Felicia is running for his life, in heels and a dress, from a pack of enraged Australian rednecks... and he's laughing his ass off until they catch him.
- In The Truman Show, Truman bursts into laughter several times when he tries to call out his "wife" on the fact that the world he's in is fake.
- The bad guy in the third Flodder movie completely loses it when an attempt to destroy the Flodders and their party by crashing a tanker truck into their house instead causes the entire rest of the neighbourhood to burn down, including his own home. He bursts into manic laughter as he's watching his own fireworks go off.
- James Bond in Casino Royale (2006), while he is being tortured by Le Chiffre.
"Now the whole world's gonna know that you died scratching my balls!"
- In the movie adaption of I Miss You I Miss You, Tina goes for a short walk with her friend Frida to calm herself down shortly after her twin sister Cilla died in an accident. They pass the school's theater and Tina remembers how Cilla, who was director of the school's theater group, predicted that everyone will cry at her theater performance. Tina begins to laugh hysterically at this memory until Frida slaps her several times.
- Reality ends with one of these, courtesy of Luciano.
- William Faulkner's Darl from As I Lay Dying. Near the end, he goes insane and when he's not reciting a Madness Mantra of "yes, yes, yes, yes...", he's laughing his head off.
- Bellatrix Lestrange from Harry Potter. All the freaking time.
- Sirius Black - after his best friend James Potter and his wife Lily Potter died, started laughing as he was arrested although he was in fact innocent. The laughter was probably a combination of all the emotions piled up on him, like betrayal, grief, and hatred.
- During the big fight at the end of book five, Ron gets hit by an "Intoxication Ensues" spell and becomes uncontrollably giggly despite still being in mortal danger.
- Tabaqui from the The Jungle Book is most likely rabid, psychotically insane, and prone to hysterical fits of laughter (so much that he is infamous throughout the Jungle, and feared possibly more than Shere Khan himself)
- Two examples from Michael Moorcock's Elric stories:
- The Weird of the White Wolf. Elric wounded Yyrkoon while fighting him. Yyrkoon starts laughing, indicating his sanity had broken.
- The Stealer of Souls. When Elric finally catches up to him, Theleb K'aarna has lost his mind and is tittering to himself.
- In the book The Hunchback of Notre Dame Frollo does one when he completely loses it in the finale.
- In H.P. Lovecraft's short stories:
- In Dan Abnett's Gaunt's Ghosts novel His Last Command, after they kill a Chaos stalker, Gaunt laughs and taunts the darkness with his still being alive. Ludd finds it more frightening than the stalker.
- In a variant, there's a really nightmarish scene in The Odyssey where a character prophesizes the slaughter of Penelope's suitors by seeing them all racked with painful, hysterical laughter and choking up blood. And still continuing to laugh as they're slaughtered.
- Vera Claythorne does this in And Then There Were None when she realizes U. N. Owen is enacting the bedtime rhyme and they're all gonna die.
- In Robert E. Howard's "The Pool of the Black One", while Conan the Barbarian and Sancha are watching the inhuman giants who have captured their comrades, he has to slap his hand over her mouth to prevent her hysterical giggle.
- The men with no pain from the Inheritance Cycle giggle madly in battle.
- Bertha Mason in Jane Eyre.
- At one point in The Long Walk, a Deadly Game involving the sometimes-gory deaths of teenage boys involved in the Walk, Garraty (the protagonist) loses it and momentarily goes Laughing Mad. It's only because McVries takes the time to get him to snap out of it that Garraty's fit of Laughing Madness doesn't slow him down to the point where he "buys his ticket."
- Rand Al'Thor in The Wheel of Time occasionally breaks down into 'mirthless laughter' when something really terrible happens. As the series goes on, these episodes become more frequent.
- In Gene Stratton-Porter's Freckles, the emotional stress of his Secret Legacy coming to light causes this in Freckles.
A laugh burst from him. The terrified Angel caught him in her arms and tried to stifle the sound. She implored and commanded. When he was too worn to utter another sound, his eyes laughed silently.
- In A Song of Ice and Fire, Catelyn Stark starts laughing hysterically after Summer, Bran's direwolf, unexpectedly breaks into her son's room and tears the throat of an assassin who was about to kill both mother and child
- And she does again in the third book, A Storm of Swords, after she witnesses her only remaining child Robb get stabbed through the chest.
- In Ruth Frances Long's The Treachery of Beautiful Things, when Jenny definitively realizes she's in Fairyland and Jack tells her that no one will believe her, Jenny starts this. She doesn't realize it's her own for a moment after the first laugh, and it lasts a good long time. Since her brother had been swallowed up by the woods before her, she knows she won't be believed, quite thoroughly.
- In Ben Mikaelsen's Touching Spirit Bear, Cole starts laughing manically after burning Garvey's shelter. He's not insane; this is probably because of his anger, and his Dark and Troubled Past.
- In Second Apocalypse, Sarl of the mercenary Skin Eaters company suffers a psychological break during a particularly brutal campaign. He becomes prone to cackling and shouting, "The slog of slogs, boys!" over the following weeks.
- In Pharaoh Sarah breaks down laughing when she learns that Lykon murdered her baby.
- In Reaper's Gale, the seventh book of the Malazan Book of the Fallen, High Mage Quick Ben has a moment where he starts laughing hysterically right after he has to confront three bloodthirsty dragons head-on and all hell breaks lose. Having been reminded of all the friends he's lost over time, seeing Hedge, one of his last friends left, knocked out by a flying dragon vertebra pushes Quick Ben over the edge for the moment.
- Our Miss Brooks: "Hobby Show" ends with Miss Brooks laughing hysterically, and smearing finger paints over her face.
- Colin Baker's Doctor Who went a little bit nutty after his regeneration. This was meant as a return the character's dangerous unpredictability.
- After his venture into the Time Vortex, Dalek Caan becomes the first "pure" Dalek to laugh.
- And reused over in "The End Of Time" regarding the Master. All six billion of them.
- Battlestar Galactica. Fisk, XO of the Pegasus, has a disturbing laugh that he gives after relating how Admiral Cain executed his predecessor. Fisk gives another such outburst in "Resurrection Ship", earning himself a puzzled look from everyone in CIC, who are unaware that Cain had just cancelled her orders to terminate them all.
- Although any number of inmates in Oz (such as Tobias Beecher) would qualify, probably the best example would be former prison guard Clayton Hughes after he goes insane and murders an inmate. Particularly disturbing when it happens in front of Warden Glynn, who regards him as a surrogate son.
- Victor, in Burn Notice, had a tendency to grin or giggle disturbingly when contemplating violence. He laughed the same way when he described why he was that way: "And then the punch line, the really, really funny part was, it was Carla. She had my family killed as part of my recruitment."
- Happens to John a bunch in Farscape as a result of all the mindscrewing. His tendency to inappropriate laughter is a big part of what clues his shipmates in on his Sanity Slippage throughout season 2.
- Avon from Blake's 7. In the season 4 episode Gold, upon realizing that he and his crew had not only accomplished nothing in the episode itself despite risking their lives repeatedly, but had actually benefited the villainess, he begins to laugh hysterically under the frightened stares of the crew.
- Adrian Monk in the Monk episode "Mr. Monk and the Garbage Strike" briefly went laughing mad after deciding to dump garbage trucks overflowing with garbage into the San Francisco Bay one at a time, and coming up with an insane theory about who murdered the Garbage Union Leader (it being the rock star Alice Cooper over envy over a chair) that was more or less done due to the piling garbage driving Monk completely insane, in addition to his previous theory being wrong (and for the record, the debunked theory was actually a lot closer to being correct compared to the second theory.).
- Chang on Community. The study group refuses to let him join even after he dances for five hours representing them in the pop and lock contest. He ends up collapsing to the floor laughing maniacally.
- In Sister Sister, Lisa Landry was breaking out into a fit of laughter during a funeral. It's justified, however, as just beforehand, she went to the dentist, and was exposed to a large, almost lethal dose of Laughing Gas due to the dentist ranting about the person the funeral was for.
- Season 4 of Breaking Bad Walt's reaction when Skyler tells him she gave Ted the $600,000 they needed to escape Gus, who said he would kill them all if Walt interfered by tipping off the DEA about the hit on Hank... which Saul had done on Walt's orders mere minutes before.
- The virus in "The Tale Of The Renegade Virus" of Are You Afraid of the Dark?.
- In the movie Kamen Rider Double Returns: Kamen Rider Eternal, the villain of the movie tries to emotionally break Katsumi Daido, the eponymous rider. It worked a little bit too well, as Katsumi breaks down in insane laughter, followed by a Curb-Stomp Battle with the villain on the receiving end.
- Professor Banno in his incarnation as Gold Drive of Kamen Rider Drive has an Evil Laugh that veers sharply into this territory on a regular basis, as he chuckles in a somewhat subdued yet decidedly eerie manner, his head lolling at odd angles.
- Buffy the Vampire Slayer. In "Prophecy Girl" Buffy has a mild episode of very unsettling laughter after she overhears Giles talking about her upcoming prophesied death. Played straight with characters who are insane: Masie the invisible girl, Mad Oracle vampire Drusilla, and Spike at the beginning of Season 7.
- Get Smart. Maxwell Smart and Agent 99 are captured by a Mad Scientist.
99: You're mad!
Dr Poston: Mad, am I??? MAAAD AM I??? MWAHAHAHAAA!!!
99: (anxiously) Don't do that!
Dr Poston: (utterly straightfaced) Don't do what?
- Columbo has some murderers do this after Columbo figures them out. The most notable cases are Roger Stanford who cracked after Columbo tells him that he doesn't have the real cigarette box, and Nicholas Frame who giggles and mutters a piece of monologue from Macbeth.
- Game of Thrones. In Season 4 Sandor Clegane and Arya Stark arrive at the Eyrie after traveling across the war-ravaged Riverlands and seeing the massacre of Robb Stark and his army just as Arya was about to be returned to her family, only to be told that the aunt Sandor hoped to ransom her to has also died only three days before. Arya's response is to break down in peals of laughter as everyone stares at her in disbelief. Like several other incidents over the past couple of seasons, it hints at Arya's increasing Sanity Slippage as she turns from heroic Tomboy Princess to cold-blooded killer.
- Blackadder. In "The Black Seal", Edmund Blackadder is trapped in a dungeon with an insane old man who laughs maniacally after Edmund asks if there's a way out. We are shown a cue card reading "Twelve Months Later". And the man is still laughing.
- "It's time for your medication, Mister Brown..." "BUHUHAHAHAHAHAHAHAHA!!!!"
- The end of "Master of Puppets" by Metallica.
- Just before the first guitar solo in the Thin Lizzy track "Chinatown".
- "Inside the Fire" by Disturbed does this while combining it with the Evil Laugh; the character in which the song is being described to is most definitely going insane, but the main narrative is being told by his dead girlfriend whispering over his shoulder (who may or may not be The Devil). In other words, it's meant to sound both crazed and demonic.
- "Afterlife" by Avenged Sevenfold features this in the bridge.
- Twilightning's "Rolling Heads" from the Bedlam EP ends with mad laughter.
- Heard in the end of Running Wild's "Diamonds of the Black Chest" when after a lifetime of searching, the song's protagonist finds the eponymous chest. And it's empty.
- Napoleon XIV's "They're Coming to Take Me Away, Ha-Haaa!" It's right there in the title.
- The Bonzo Dog Band did a cover of "Monster Mash" that was pretty faithful to the original, until the ending, where vocalist Vivian Stanshall goes into an Evil Laugh that grows more and more manic through the fade-out.
- "Departure", the Graeme Edge poem that opens The Moody Blues' "Ride My See-Saw", has Edge dissolving into mad laughter as it crossfades into the latter track.
- Pink Floyd's "Brain Damage" from The Dark Side of the Moon. (The lunatic is on the grass... (laughter))
- The Police's "Mother," about a man whose overprotective, constantly-phoning mother has driven him mad, ends with manic cries that turn into laughter.
- Doctor Steel can be heard engaging in a mad laugh near the end of his self-titled song, "Dr. Steel."
- The end of Black Sabbath's "Am I Going Insane? (Radio)" has Ozzy Osbourne breaking into a series of distorted, crazed laughter.
- Ozzy is quite notorious for this, to the point where many a song of his features it. It's practically his trademark.
- Arthur Brown does this a bit near the end of "Fire" as he's shouting "Burn!" over and over at the top of his lungs.
- In one version of "Beginning to look a lot like Christmas", the second chorus of 'and mom and dad can hardly wait for school to start again' is immediately followed by the female backup singers doing a not quite sane laugh just like the parents finally snapping due to holiday stress.
- Eben Brooks engages in one of these at the end of his filk "Hey There Cthulhu" as the narrator finally succumbs to madness. It ends with a bloodcurdling scream as he apparently succumbs to something far worse.
- The singer of Poets of the Fall's "Psychosis" opens and punctuates his bitter ranting with nasty chuckling.
- Terry Funk in his famous 1981 "Florida Cracker" promo.
- Buzz Sawyer was prone to fits of it, particularly remembered is a bit during a Kevin Sullivan promo were he just starts laughing of no discernible reason and just won't stop.
- Dan Spivey tended to degenerate into maniacal laughter when applying his sleeper hold.
- By definition, almost every time Psycho Sid burst into laughter was a case of this.
- Hugh Morrus' whole gimmick was based on this, starting with his Punny Name. His Red Baron was "The Laughing Man." In the Dungeon of Doom vignette where "The Taskmaster" Kevin Sullivan introduced him to the Master, Sullivan said that he was giving the him, "the greatest gift of all, laughter."
- Willow The Wisp in the Omega Promotion, he is but a product of Jeff Hardy's imagination, "Raaahahahaha!" He tended to laugh even when being beat up.
- During Delirious matches where he is allowed to idle or otherwise given breathing room, he tends to talk himself and laugh.
- Tyler Bateman tends to stare off into the distance silently. When something gets his attention or he's asked to speak he'll usually let out a prolonged wheeze before degenerating into laughter.
- Mikey Whipwreck after joining the Sinister Minister in Major League Wrestling.
- Boogeyman was often laughing, particularly after singing to his hosts, spouting off poetry or squeezing the heart on his necklace.
- After Mickie James attacked Trish Stratus for suggesting they should spend sometime apart, she was later found cackling over a Trish Stratus shrine.
- Sting frequently during his "Joker" phase, as opposed to his previous and more famous stoic "Crow" phase.
- Cody Rhodes during his "undashing phase", where his recollection of events was clearly off base. (he believed himself disfigured and thus un dashing, having to hid behind a mask, except his mask was see through so everyone could see he looked exactly the same.
- Leva Bates as the joker during her the final stages of her SHINE feud with Kimberly, going into the the "Arkham Asylum match".
- Numerous followers of Chaos in Warhammer and Warhammer 40,000 alternate between this and Evil Laugh, sometimes combining the two for extra madness. Sort of inevitable when one allows The Legions of Hell to use one's skull as their metaphorical playground.
- In Exalted, Adorjan the Silent Wind is considered the Yozi patron of Ax-Crazy. As a result, her chosen Infernals tend to get access to Charms that reflect this, such as Broken Silence Laughter Defense (which allows the Infernal to throw off attempts to influence them by laughing inappropriately) and Eloquence in Unspoken Words (which gives the Infernal telepathic communication, at the price that they can only vocalize laughter).
- In Sweeney Todd: The Demon Barber of Fleet Street, the song "Epiphany" details his Despair Event Horizon and the whole song has a lot of anguished laughter, especially the end where he declares he's "full of joy". Then comes the Mood Dissonance of the next song "Little Priest", where he is really upbeat, but completely over the edge of sanity.
- Also his wife Lucy when she enters Sweeney Todd`s parlor. She lapses into a disturbing giggle before she imagines herself sitting with infant Johanna in her arms.
- William Shakespeare uses this one in Titus Andronicus: Titus' daughter has been raped and mutilated, his sons have been accused of the crime, and he's been told they'll be pardoned if he just chops off his hand, so he does, and when he's given his hand back along with their severed heads, he begins to laugh. And plot tasty, tasty revenge.
- Electricidad, Luís Alfaro's modern retelling of Electra ends with Orestes doing this after killing Clamencia as he stumbles away from Nino, and collapses on top of the charred, rotting remains of his father's body. It's chilling.
- In Theatre/Wicked depending on the actress playing her (as well as the one playing Glinda), Elphaba can have shades of this when she cackles after Glinda slaps her during the cat fight scene. Bonus points if it's the exact same cackle from the film.
- Street Fighter has several. Vega, Adon, and Juri are probably some of the best examples. All three aren't exactly mentally stable and tend to let out insane laughs while fighting.
- Shadow the Hedgehog ends several of his stories with an insane and/or evil laugh, including the ones where he plans to destroy the world and when he plans to take over the Black Arms empire.
- Eggman is this in the pre-final boss cutscene in Sonic Generations. Lampshaded by Classic Eggman. "Wow, will I really get that crazy?"
- Albedo in Xenosaga. His first freak-out, back in the past, involves him interfacing with U-DO and laughing like a maniac. Considering he looks about nine years old at the time, this is profoundly disturbing.
- Or that he's laughing while ripping himself apart.
- The first sign that Alex's hold on reality in Eternal Darkness may be none too steady is the way her sobs when she first sees her grandfather's dead body are shot through with thin veins of laughter.
- Maximillian Roivas hits this trope for brief intervals in his monster autopsy narrations, as well.
- Daniella from Haunting Ground. She does this in cutscenes in a very creepy manner and at a certain stage of insanity while chasing you.
- Fiona too, in the worst ending.
- Porky Minch seemingly loses his mind in the final battle of Earthbound, blithely releasing the lock on Giygas (purportedly his 'boss'). This renders Giygas unable to stem the tide of his power, which threatens to consume the entire universe. Porky addresses the player to admit he's afraid. And laughs.
- In the direct sequel MOTHER 3, the team confronts a decrepit version of Porky, who has sent his robotic minion to bring forth the Dark Dragon. Until this point, it's unclear whether or not he has any idea what the Dark Dragon — a godlike being that fulfills the heart's desire of whoever summons it — will do if that summoner literally has no heart. Turns out, Porky has gradually come to the same conclusion:
""If the dragon wakes up, it might end up destroying everything and extinguishing all life. Even so ............ahaha aha ahahahahahaha!!"
- In the direct sequel MOTHER 3, the team confronts a decrepit version of Porky, who has sent his robotic minion to bring forth the Dark Dragon. Until this point, it's unclear whether or not he has any idea what the Dark Dragon — a godlike being that fulfills the heart's desire of whoever summons it — will do if that summoner literally has no heart. Turns out, Porky has gradually come to the same conclusion:
- Lampshaded two times in Final Fantasy X, first when Tidus and Yuna talk about the importance of being happy and burst onto a cheery, loud laughter with no apparent reason. When they turn around they see all others staring them with a weird look on their faces. When questioned, Wakka quietly says: "We thought that you lost your minds." Done second time in Thunder Planes, where Rikku - who's deathly afraid of thunder - keep laughing nervously as they walk, prompting Tidus to comment on it: "Heh heh, heh. You're giving me the creeps!"
- Kuja in Final Fantasy IX went Laughing Mad as soon as he learns from Garland's disembodied spirit that he'll die soon.
- One of the first signs that Sephiroth went mad upon learning about his supposedly being the last Ancient is chuckling dementedly as Cloud/Zack entered the lab he was researching inside.
- Adam the Clown in Dead Rising laughs all the way through his monologue when he recalls his audience being eaten by zombies.
- After bring defeated, he laughs and falls. Onto his still running chainsaws. The laughter doesn't stop until he's dead...
- And it doesn't just get weaker and weaker. It gets deeper and slower.
- Brent "Slappy" Ernst of Dead Rising 2 also engages in this during his boss fight, such as when performing a fire spin and/or shouting things like "I'm a little teapot!"
- After bring defeated, he laughs and falls. Onto his still running chainsaws. The laughter doesn't stop until he's dead...
- Very well done with Laughing Octopus in Metal Gear Solid 4. Since she was mind raped and turned into a psychopathic killer as a teenage girl, she never stopped laughing, even though her memories were constantly torturing her. She laughs throughout the entire boss fight and falls down laughing when she is fatally shot, making her a quite creepy encounter and not funny at all.
- At one very brief moment of relative clarity before dying she even says "No, nothing is funny. I shouldn't be laughing."
- Ed of Meryl's Rat Patrol 1 group, after the SOP system was locked down due to it refusing Liquid's DNA, went Laughing Mad.
- Actually, any soldier who is hit with the laughing emotive ammo will undergo symptoms of Laughing Mad.
- Raiden goes through this in Metal Gear Rising: Revengeance after embracing his Jack the Ripper persona prior to his battle with Monsoon. To see the previously calm and collected Raiden gleefully chop apart three enemy cyborgs after turning off his pain inhibitors is nothing short of chilling.
- The trope namer (Sort of, the name is a reference to his Crowning Music Of Awesome Dancing Mad) is Kefka, the Monster Clown Big Bad of Final Fantasy VI. His laugh is such a big part of his character, they had to make it a pre-rendered soundbit to play every time. The laugh goes to show just how evil and insane Kefka really is, considering that he laughs most often at death, destruction, and mayhem. The game states that Kefka went insane after being the first subject for magic infusion. Apparently they hadn't perfected the process yet.
- Take the definition of this trope, then apply it to Dancing Mad, then apply it to Kefka's character overall. Feel that? That's the awesome sinking in. It's also the closest thing to officially-stated motivation Kefka has.
- It is also implied in Dissidia that his maniacal laughter is also really the only thing he could give as a reaction in regards to several things, regardless of what emotion he was actually feeling. For instance, when Kefka is defeated in Shade Impulse and explodes after giving his nihilistic speech, he can be heard laughing, but not a joyous laugh, a sorrowful one, and Firion mentions in his opening quote that he's never heard "a sadder laugh."
- Cu Chaspel
- Ripper Roo from Crash Bandicoot after being exposed to different experiments from Dr. Cortex became a raving, laughing, lunatic in fact after his brain was tampered with all of his dialogue consists of insane laughter with subtitles to translate.
- Father Grigori, the Zombie-slaughtering Badass Preacher of Half-Life 2 often breaks down into short bursts of maniacal laughter due to him being driven to insanity after the citizens of Ravenholm have become zombies.
- Queen Zeal from Chrono Trigger. Every time she shows up to challenge you, she's got a crazy laugh going, even well after you've destroyed the Mammon Machine and defeated her in her One-Winged Angel form.
- Ganondorf from The Legend of Zelda gets quite a few Evil Laughs throughout the series, but his laughter just before the final boss fight in The Wind Waker after the king wishes on the Triforce to flood Hyrule was definitely Laughing Mad.
- BlazBlue showcases Jin Kisaragi's slow descent into madness, and once he finally finds Ragna the Bloodedge, he completely snaps and starts speaking to him in a rather disturbing manner. Then there's Arakune, who ends as many as half of his dialogues with raving Voice of the Legion laughter. Nu-13 doesn't seem like the laughing type, but has been known to cackle admirably on occasion. And then there's Terumi...goddamn. All in all, the BlazBlue world could probably do with sedatives in the water supply.
- Breath of Fire IV's Fou-lu starts laughing after realising that Mami was used to fuel the Hex Cannon, which is what ultimately breaks him and decide to Kill 'em All on those bastard humans.
- The Heavy and Scout from Team Fortress 2 can laugh maniacally if you get trigger-happy enough with the Minigun/Natascha and the Force-a'-Nature, respectively. Also, the Announcer.
The Spy, when dominating a Medic: LAUGHTER REALLY IS THE BEST MEDICINE! AHAHAHAHAHAHA!
- Also this.
- Actually, since they are all completely insane, all the classes qualify, most notably the Spy, who is so over the top sadistic that he laughs in almost every single domination line.
- Sae Kurosawa ... Oh god, just thinking about it makes me scared.
- Believe it or not, in the "Frozen Butterfly" ending... Mayu manages to top it.
- Marx 'soul... During battle it can easily border on Hell Is That Noise.
- Revya from Soul Nomad & the World Eaters gets a pretty good laugh in the bad ending of the Demon Path.
- Zagi, from Tales of Vesperia. About 50% of his dialogue is maniacal laughter, 25% is about how much he wants to "carve Yuri's name into his blood", and the remaining 25% is utter nonsense.
- Mega Man:
- Dr. Weil from the Mega Man Zero series qualifies, especially when taking into account the relevation of his survival from Ragnarok's attack and his reaction after Zero defeated him the first time.
- Serpent from Mega Man ZX qualifies, considering his reaction to being absorbed by Model W's core.
- Megaman ZX Advent:
- Siarnaq does an evil laugh when he defeats you. But, if you are playing the japanese version...
Siarnaq:NEXT OBJECTIVE: CONTROL CENTRAL OF LEGION HEADQUARTERS. Hihi- Hihahahaha!
- Prometheus gets a pretty good one in Advent after he kills the Albert decoy.
- Then the REAL Albert gets an even better one after the Model Ws begin to merge.
- Siarnaq does an evil laugh when he defeats you. But, if you are playing the japanese version...
- Zero from the Mega Man X series (while he was still a Maverick) also had bouts of the trope, made especially apparent when he was beating Sigma to a bloody pulp when the latter was at his mercy.
- A few times during Metroid Prime 2: Echoes, Dark Samus often starts breaking into maniacal laughter. Similarly, in Metroid Prime 3: Corruption, after Gandrayda, while disguised as a GF Trooper, attempted to shoot Samus in the back and missed, started going into a fit of hysterical laughter.
- Adele from Arc Rise Fantasia took finding out that she was an Unlucky Childhood Friend very badly.
- In Cave Story's Bonus Dungeon, the boss Ballos states that when his magic went wild and he killed everyone in the kingdom, he could only stand where he was and laugh.
- In the anarch and independent endings of Vampire: The Masquerade – Bloodlines, Sebastian LaCroix gets down with the best of them when he realizes that the MacGuffin he just opened is not so much a 'gateway to infinite power' as a 'gateway to horrible burning pain' and he's been played for an Unwitting Pawn.
- Lezard Valeth from Valkyrie Profile should not be forgotten. When he lost all his apparent sanity at the end of the game, he's really scary. His break mode is epic, too.
- In killer7, the first indication of an approaching enemy is always a little insane giggle. If you're too slow with your gun, it's followed by a shrieking laugh as they blow up in your face.
- In Suikoden II, the main villain, Luca Blight is known to often punctuate his horrific actions with a horse like Evil Laugh. However, when he is finally near death, he lets out a speal of insane laughter filling up more than 3 dialogue boxes that can't be classified as anything but this.
- Bobby Barrows, aka "Scissorman" in Clock Tower often seems to giggle. In fact, the first sign that he is nearby is that he cackles.
- In Super Paper Mario, a Sammer Guy, appropriately named Laughing X-Naut, laughs a long, loud laugh as the Void in his dimension fully matures, destroying his entire universe. He laughs all the way until his inevitable annihilation.
- Iggy Koopa, one of the Koopalings, is depicted as Laughing Mad in New Super Mario Bros. Wii. Given that the (English) post defeat narrative on Iggy in Super Mario World described him as "demented," this shouldn't come as a surprise.
- In City of Heroes, one of the Enemy Chatter for the Freakshow is simply a manic laugh, which was demonstrated by one Freak in the original trailer.
- If Yamazaki is feeling jovial, you know the walls are about to be painted red.
- Kubikiri Basara from the Samurai Shodown series. His post-mortem insanity has him hunting down Minazuki Zankuro and giggling all the way.
- Ribsmasher, a batshit insane monk in Neverwinter Nights 2: Storm of Zehirnote In literally every line he has large chunks of scenery get chewed, and they all involve raucous laughter and/or smashing ribs.
- The Manic Psychotic voiceset does this a lot as well. Including when he dies, which takes the usually hilariously hammy voicing into creepy territory.
- An update for Jojos Bizarre Adventure All Star Battle added laughing taunts for the characters who fought the Sun stand during Part 3. Certainly seeing Jotaro and Kakyoin laugh hysterically at how pathetic you are must be very unsettling...
- In one Cthulhu Mythos based MUD the status of your Sanity Meter is represented by various adjectives, with the adjective varying depending upon how high or low it is. Well, except for when your sanity hits rock bottom. At that point the adjective is replaced by "HAHAHAHAHA!!!", with each "HA" being a different color.
- In Telepath Tactics, Climax Boss Archos does this as part of his Last Words.
- Dawn of War: Chaos Space Marines and Imperial Guard Psykers are inclined towards fits of raucous laughter audible to enemies as the Warp seeps in and out of their brain. The psykers, by the way, are with the good guys.
- Alan Wake's American Nightmare has Poets of the Fall's "The Happy Song," the Villain Song of Serial Killer Mr. Scratch, wherein an Ax-Crazy singer punctuates his open admissions that he's "a psycho" with husky chuckles or shrieky laughter depending on whether his Evil Gloating takes the form of a mock-conspiratorial whisper or an enthusiastic scream.
- In the Ace Attorney series, Luke Atmey and Kristoph Gavin laugh disturbingly upon defeat, possibly to indicate madness (they're both pretty crazy). Damon Gant gets the most epic one, however: he claps as he laughs, and as the laugh revs up, his hands slam together so quickly they throw off sparks!
- The tradition continues in Ace Attorney Investigations: Miles Edgeworth, where the killer of case four, Calisto Yew, ends up doubled over laughing by the time he/she is done... and then shows just how sane she is by pointing out Edgeworth just accused her of murder... in a case where one of the pistols is still missing. And then case five happens and holy hell is Shih-na's breakdown some quality horror.
- A non-villainous example is Lotta Hart from Justice For All. She thinks that the crime scene will be her one big break and starts laughing crazily as she runs to it. Even Phoenix got scared when that happened.
- Nine Hours, Nine Persons, Nine Doors:
- Ace/Hongou is revealed to have done this when he locked Akane in the furnace to force her to use morphogenic fields to survive.
- He does the same thing when confronted as the villain in the Safe ending.
- Beatrice in Umineko: When They Cry does this intentionally to unnerve opponents (which is probably where Maria learned her own creepy laugh,) and is quite at ease when laughing mad. This is in contrast to Erika, who laughs more madly when under more pressure, up to and including full Villainous Breakdown.
- In Dangan Ronpa, Genocide Jill (AKA Toko Fukawa's murderous alternate personality) is usually this when they're not fawning over Byakuya.
- Flippy of Happy Tree Friends whenever he goes into Ax-Crazy mode. Also, the hyperactive squirrel, Nutty.
- Homestar Runner: Strong Bad goes into a rather creepy mad laughing fit in the Sbemail "isp" after discovering that Strong Mad has screwed up his Internet connection by literally sucking up bandwidth.
- Rachel at the end of the Knot of Wool arc in Tower of God.
- According to the story hidden in the filenames of Narbonic, this is how Helen went mad:
She laughed hysterically for a minute or so. Not a good sign, she thought. And then the thought fluttered away. Her face, when it skipped into focus, was pale and blotchy. Possibly she had been crying. Yes, someone had definitely been crying sometime. Not her. Not when everything was so funny and she had so many interesting ideas...
- Ellen in El Goonish Shive does one of this, complete with a line that goes behind a character's head to show they've snapped when she is first brought into existence, and she thinks that she'll die in a month. The comic title says it all. She then decides to become Elliot's evil twin, which she's... not too good at...
Tedd: [not too Genre Savvy] Oh good! She's laughing!
- Sandra Eastlake in Zebra Girl, just after her heroic BSOD/Face Heel Turn.
- When Computer returns to perform horrifying acts of vengeance against the J&C cast she is always seen grinning madly, though not laughing.
- Valentino descends to this after being tricked into killing her one and only friend from her Training from Hell during a side/origin story in the comic Marilith.
- Rocky and Freckle in Lackadaisy, mostly whenever they're either cheating death or dealing it.
- Jane Unpleasant in Everyday Heroes enjoys a chuckle.
- Hyde from The Search For Henry Jekyll cackles hysterically after killing his first victim.
- Cake Girl from Gloomverse tends to randomly burst into laughter.
- In the Dangan Ronpa/Rabbit Doubt hybrid Doubt Academy, Akari Kagome, the Super High School Level Hockey Player, has one of these when she realizes she's going to be executed for a murder she didn't commit.
- Dr. Horrible's Sing-Along Blog: Dr. Horrible starts out maniacal laughing because he's Genre Savvy, and then does the laugh again because it's situationally appropriate. Even though we see his Sanity Slippage happening immediately in the next song... we never see him laugh again. It's almost like he went sane.
- Everyman HYBRID, "Joke's Over" - Evan, on seeing what was inside the garbage bags hung up by the Slender Man. He hadn't completely snapped yet, but this was probably one of the first warning signs.
- Dr. Insano of Atop the Fourth Wall and The Spoony Experiment is prone to this.
- The Nostalgia Critic:
- At the end of his review of The Neverending Story 3, the Critic starts laughing nonstop as he leaves his house, drives to an Home Depot to pick up a crowbar, and heads back home. He stops laughing when he smashes up the DVD, AVGN-style.
- He does it again in the Master of Disguise review, where he responds to a "funny" joke by flipping out, laughing insanely, and beating three people with a baseball bat.
Critic: ...Where was I for the last two minutes?
- Doug himself has a tendency to do this, annoying Rob in the Man of Steel Sibling Rivalry and painting himself as The Woobie in the first Adventure Time review.
- One Hundred Yard Stare: Ellie goes laughing mad for a moment in episode five. And later several times, also this is her basic mode in season two.
- The ending of the Two Saiyans Play of Outlast has Krillin laughing maniacally. This was in the official, re-recorded version.
- The YouTuber The Orange Insanity slowly but surely starts laughing maniacally in his review of The Last Airbender, before going into Cry Laughing after seeing the scene in which the dragon tells Aang that the Avatar is not meant to hurt others.
- Turpster falls into this when he plays either as the titular character in The Hidden, or as the murderer in Garry's Mod Murder, and decides to ham it up.
- Poor slowbeef. In his Sonic the Hedgehog (2006) Let's Play on the Retsupurae channel, after losing his last life in Silver's version of the Kingdom Valley level, he realises that the last time he'd saved was over an hour in the past, meaning that he'll be forced to replay the sections with Anna and the ProtonJon priests' tests. Upon this realisation, all he could do was burst into laughter, while Diabetus could only utter a Flat "What.".
- Linkara did this himself in his History of Power Rangers review detailing Power Rangers Megaforce, as his reaction to Robo Knight's Unexplained Recovery, cutting to video of him laughing as he grabs a gun, walks off, empties the clip, and his laughing turns to screaming.
- The Super Gaming Bros. had a moment in their multiplayer Sonic the Hedgehog (2006) playthough. Elliot dies to three meteors in a row; causing Matt to laugh himself insane.
- Azula in the series finale of Avatar: The Last Airbender, during her schizo Freak Out.
- In The Spectacular Spider-Man, when Harry Osborn thinks that he was blacking out and becoming the Green Goblin, one of his many reactions, besides depression and anger, is semi-maniacal chuckling.
- Another Spider-Man Example. In fact, another Harry Osborn example. In the 90's Spider-Man show, when Harry finds out that The Green Goblin was his father, he goes into a laughing fit (his mind wasn't too stable at the moment, he was talking to his father's ethereal head from another dimension and all that... long story...) and then decides to "fulfill his destiny" and become the second Goblin.
- Ren of The Ren & Stimpy Show is often portrayed as this.
- Most extreme cases include when he was under the effects of the happy helmet (complete with a full set of grimaces), and when he was beating George Liquor up with an oar in a banned episode, "Man's Best Friend".
- In one episode of Adventures in Care-a-Lot, a sleep-deprived Bedtime is portrayed this way.
- In The Batman's Harley Quinn episode, the way the viewer can tell that Harley's returned sanity is fleeting is when she starts laughing maniacally.
- Batman: The Animated Series: The Demon's Quest, when Ra's al Ghul comes out of the Lazarus Pit.
- Any time the Joker laughs.
- Then there's Jack Ryder, who as the Creeper giggles like a stoner watching YouTube.
- At the end of Batman Beyond's first episode, when Corrupt Corporate Executive Derek Powers sees that he has transformed into a glow-in-the-dark radioactive skeleton man, his immediate reaction is to begin laughing maniacally. The doctors are appropriately freaked out.
- Looney Tunes - Daffy Duck.
- Ed, Edd 'n' Eddy: Eddy does this in "Little Ed Blue" after realizing why Ed was angry and antisocial all day. There was a pebble in his shoe.
- In "Cleanliness is Next to Edness", Edd goes insane after failing to find a place to bathe and getting dirtier with every attempt. He snaps out of it, eventually.
- Lisa Simpson briefly went Laughing Mad when seeing her new braces in the episode Last Exit To Springfield, of which it was a direct homage to Jack Napier's reaction to his new appearance due to botched reconstructive surgery and falling into the vat of chemicals.
Kent Brockman: And look how happy he is!
Homer: Alright, alright, you win for now. But someday you'll RUST! RUST, I TELL YOU! [Descends into deranged, maniacal laughter]
- Homer, after a trampoline pushes him over the edge, tries and fails to destroy it with a circular saw.
Homer: They're dogs, and they're playing poker! [Screams, more deranged laughter.]
- Also one of the show's Halloween episodes, which features a certain painting, the mere glimpse of which drives people mad:
- On Jimmy Two-Shoes, when Lucius suffers a Villainous Breakdown, he begins laughing wildly before completely cracking.
- Hexadecimal from ReBoot enjoys her evil laughter, but, being pretty crazy, she tends towards Laughing Mad on more than one occasion. Then she becomes outright insane in season 3, due to a combination of being nearly destroyed in an explosion and subsequently rebuilt, her mask becoming cracked, and being tortured and used as a weapon by Megabyte. After this, pretty much every time she laughs is an example of Laughing Mad. (At least, until Bob defragments her head.)
- Spongebob Squarepants during the season 4 episode Bummer Vacation. "I've been WAITING for you Patrick!"
- Squidward during the episode "Squid's Day Off" after he goes crazy from paranoia as he's nailing his door shut.
- Fluttershy in the My Little Pony: Friendship Is Magic episode "The Best Night Ever".
- Twilight Sparkle as well, in "Lesson Zero".
- Nightmare Moon, arguably.
- Spike's turn: "Owl's Well That Ends Well".
- In Family Guy Meg is sometimes portrayed as deranged or disturbed out of a desperation for love and attention. In one scene Chris asks her what kind of gifts boys have gotten for her and she describes imaginary gifts given to her by her imaginary boyfriend prince William before laughing crazily and running out of the room in tears.
- Invader Zim, being rather Ax-Crazy, has moments like this.
- In Adventure Time, we have Lemongrab's utterly disturbing laughing fit in Too Young. He doesn't even SMILE- his head just flails around and bounces with weird squishy noises, and his eyes are wide.
- Lemongrab: "...Prank? F-for laughs? Yes, of course; just a harmless prank... F..for laughs... Ha..a.a? HAHAHAHAHHAHAHAHAH-OH! HAHHAHOAHAOHAOAHOAHAOAHAHAOAOAAHAOAHAOAHAOA-" *immediately returns to normal* "Twelve years dungeon! All of you- DUNGEON! Seven years, no trials! C'mon... LET'S MOVE IT!!!"
- He comes by it honestly; his mother Princess Bubblegum reacted similarly to the prospect of Finn bringing the Duke of Nuts to justice. "The justice... of a COLD DUNGEON! MWAHAHAHA-AHAHAHAHAAHAAA!!!" Jake Lampshades the moment by saying with an awkward laugh, "She's completely bonkers."
- In Teen Titans "Nevermore" when Robin and Starfire go onto the roof of Titans Tower to tell Raven about her door being broken down, she breaks out into hysterical laughter which sounds just like something out of Higurashi: When They Cry, then she just abruptly stops and goes inside.
- Stu of Rugrats does this during his Sanity Slippage moment in the episode "Angelica Breaks A Leg."
- In Wakfu season 2 episode 20, Qilby goes completely nuts after merging with the Eliacube and laughs maniacally during his Teleport Spam at the tail-end of his fight with Adamai.
- Played completely straight in the infamous Hercules/Aladdin: The Series crossover episode "Hercules and the Arabian Nights". Shortly after Jafar is revived by Hades, he starts using his cane to cause huge amounts of destruction in Hades' lair, while laughing maniacally, causing Hades to object and even go as far as to take away his cane (which is his only lifeline) to get him to obey.
Hades: The laughing, what's with that?!
Jafar: It's a flourish. AAAAHAHAHAHAH!
Hades: You are such a freak...
- Later on he joins in, commenting that he gets why Jafar does it; 'it's refreshing'.
- Candace from Phineas and Ferb does this. Sometimes right after denying that she's crazy.
- Bill Cipher from Gravity Falls does this often. Because he's insane.
- The animated adaptation of Wyrd Sisters has Felmet going more and more insane, and as he slips further off the slippery slope he sure lets out a lot of maniacal laughing.
- In The Transformers Season 3 episode "Five Faces of Darkness, part II" after being freed from the plasma lava on Thrull, Galvatron has become deranged from being immersed in the lava for over a year. He begins laughing maniacally after he demonstrates his newfound power on his would-be rescuers before agreeing to reclaim his position of Decepticon leader.
- Steven Universe: Having just committed treason against Homeworld by disobeying and insulting Yellow Diamond, Peridot is having the Freak Out of a life-time, alternating between fits of horror and fits of manic giggling while replaying the phrase "traitorous clod" over and over again on her tape recorder. When Steven asks if she'll be okay, she turns around with a manic grin and delivers an equally deranged "No!".
- In the famous Milgram Experiment, which was meant to test how far normal people would go when obeying the orders of someone in a position of authority, one of the subjects, an encyclopedia salesman, went into fits of hysterical laughter when he heard the screams of pain from his supposed victims, to the point where the session had to be discontinued. He wasn't a sadist, or insane; the laughter was just an indicator of the extreme emotional stress he was under.
- There's a condition called Pseudobulbar Affect, in which the patient loses the ability to regulate emotional expression. They may collapse into a sobbing heap at the sight of a kitten, show absolute terror at their loved ones or laugh hysterically and uncontrollably at the loss of something dear to them. This is involuntary.
- According to legend, Nero was laughing while watching Rome burn, though we only have his enemies' word on this. It's unclear whether he was even in the city at the time.
- According to Suetonius,note Caligula once broke into a laughing fit at a banquet. When two of the guests asked him what he was laughing about, the emperor said, "What do you suppose, except that at a single nod of mine both of you could have your throats cut on the spot?"
- John Lennon broke down into hysterical laughter upon hearing that his friend Stu Sutcliffe had died. He did the same thing after his mother had passed away.
- Many people use laughter as a defense mechanism, in order to deal with some terrible thing.
- Shellshocked veterans after World War I happened to laugh madly in some cases. One soldier discharged from the US army, broke down laughing for most of his remaining life, after being ordered to drive his tank over soldiers who were Not Quite Dead. That experience led to a complete breakdown and a veteran locked away Laughing Mad.
- There are some cultures that use laughter as a means of dealing with emotionally heavy moments, e.g. Australia and the UK, which can seem like this trope to those unfamiliar with this.