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->''"It is remarkable how similar the pattern of love is to the pattern of '''insanity'''.''"
-->-- '''The Merovingian''', ''Film/TheMatrixRevolutions''
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Being in love can cause a person to behave strangely and [[LoveMakesYouDumb irrationally]], a tendency which is often exaggerated in television and film. Usually played for laughs in {{Sitcom}}s and anime, it can be used as a motivation for [[LoveMakesYouEvil villainous]] (or at least uncharacteristic) behavior in more serious stories. However, it can also result in behaviors that are presented as being noble, though unusual.

A special case of this is the StalkerWithACrush, who often shows other irrational behavior as well. Many other special cases (MadLove, LoveHungry, PsychoLesbian, {{Yandere}}, LaceratingLoveLanguage) also exist, meeting obvious conditions. All of these can overlap, and often do, even ones which seem contradictory. May involve dancing TheMasochismTango when the love is requited (or [[UsefulNotes/{{BDSM}} actual masochism]] of the psychological sort when it isn't).

If the writers have a deeper understanding of relationships, they may have "true" love not cause this effect, contrasting it with the crushes we've seen elsewhere in the series. This is relatively rare, though.

If two characters are the [[GreenEyedMonster romantic rivals]] in a LoveTriangle, one may become a RivalTurnedEvil. This is especially common in daytime soaps.

The ChickMagnet and HeadTurningBeauty make ''everyone'' they meet crazy. Usually.

For people who hold this as their viewpoint about love, see SillyRabbitRomanceIsForKids Of course, [[LoveMakesYouEvil things could be worse...]] or ''[[LoveRedeems better.]]'' For the RomanticFalseLead going crazy to make the relationship easier for the OfficialCouple, see DerailingLoveInterests.

----
!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* ''Literature/AiNoKusabi'' has Guy, who is so in love with Riki, not only does he [[spoiler:give Riki a penectomy to remove the pet ring that was on his penis upon being told that as long as Riki wears Iason's pet ring he'll never be free of him, but he also blows up an entire fortress in an attempt to kill Iason]]. Second example is Iason, who, like Guy, becomes extremely obsessed with Riki. It's not touched upon in the old OVA, but the novel and audio drama have scenes where Riki slept with a female pet, and he was subsequently brutally tortured by Iason. Not to mention the number of times Iason forces Riki into having sex with him.
* Three years of FalseStart after FalseStart when she tries to approach Sakaki have left poor Kaorin of ''Manga/AzumangaDaioh'' with more neuroses than a Creator/WoodyAllen film festival. She's fine when she's thinking about something else, but once she sees Sakaki... or thinks about Sakaki... or has a dream about Sakaki... et cetera... she becomes an odd combination of ClingyJealousGirl and CannotSpitItOut.
* ''Manga/{{Basilisk}}'':
** ActionGirl Hotarubi is... well, not exactly "there" when something bad happens to her husband, Yashamaru. [[spoiler: And she ends up ''dead'' because of it.]]
** Not to overlook Kagerou, who gets insanely jealous of Oboro [[spoiler: enough to even attempt killing Gennosuke]].
** Oboro was clever enough to actually recognize this trope and [[spoiler: temporarily blind herself]] to ''not'' invoke it on her own clansmen.
* ''Manga/BloodBlockadeBattlefront'' has Aligura, the Queen of Monomania. In Episode 5, we're formally introduced to her tearing her way through the streets of New York in a ''MASSIVE'' monster truck, looking for her ex-boyfriend, Deldro Brody. She's eventually revealed to have ''extracted Deldro's blood'' and put it inside the resident hot guy Dog Hummer because she didn't think Deldro was hot enough. (Don't worry, though. [[TheSymbiote Deldro's]] [[TwoBeingsOneBody fine.]])
* ''Anime/CodeGeass'': Poor Nina Einstein. She started as an inoffensive ShrinkingViolet, only to develop a crush on [[RebelliousPrincess Princess Euphemia]] after she saved Nina (and others) from terrorists, and went kinda [[PsychoLesbian loopy]], earning her the label of TheScrappy among the fandom. Then things went worse: [[spoiler:Euphemia is killed by the terrorist Zero, which sends Nina off the deep end, leading her to develop the world's first atomic bomb. It fails, but the Britannians hire her as a researcher, and eventually her perfected bomb leads to the destruction of a good chunk of Tokyo and the ten million people in it. Not helping matters at all is the fact that she was practically rabid in ordering its use up until she saw the SphereOfDestruction (and the 35 million deaths) it caused, only then getting her MyGodWhatHaveIDone moment]].
* In ''Anime/Danganronpa3TheEndOfHopesPeakHighSchool'', [[spoiler:Kyousuke]]'s love for Chisa [[spoiler:(and grief at her murder)]] drives him literally insane. Like, 'deluded enough to massacre everyone, including his mentor and best friend' insane. He believes he lost "everything" when [[spoiler:she died]].
* ''Literature/{{Durarara}}'': The entire series is all about love making everyone crazy. It's also generally not portrayed as a ''bad'' thing, at least not directly.
** To start with, Seiji Yagiri falls in love with a severed head and spends years obsessing over it. He even drops out of school over it. His sister Namie enables this behavior [[BrotherSisterIncest because she is in love with him,]] [[spoiler:and ends up losing her company after she makes too many bad plays for Seiji's sake]].
** Mika Harima, Anri's friend, was stalking Seiji before school started. Then she disappeared. [[spoiler:She broke into Seiji's apartment and found the head, so Seiji tried to kill her. She survived, and Namie gave her MagicPlasticSurgery to look like she had the head grafted onto her body. Once Seiji discovers this, he decides to continue dating her so long as she understands that he'll leave her the second he finds the head. Mika agrees, but begins looking for the head so that she can destroy it before Seiji finds it (not that this will be easy, as the head has a very impressive HealingFactor).]]
** Shinra Kishitani has been in love with Celty, the headless rider (and the body that goes along with the head that Seiji is in love with) ever since he was a little kid. On the day they met, his father vivisected Celty and invited Shinra to help. Shinra has been telling people ever since that he's going to marry Celty one day, and tries to encourage her to abandon searching for her lost head because he's afraid when she gets her memories back, she'll be a different person. [[spoiler:When she does find it (and turns out to be the same person as before, just with new responsibilities), he ends up using a SoulCuttingBlade to separate her from it again. She forgives him, [[AllLovingHero as he expected]].]]
** Anri Sonohara is an inversion; the most notable thing about her is her [[WhatIsThisThingYouCallLove inability to love anyone]]. [[spoiler:This is what lets her wield the demonic blade Saika without being controlled.]]
** Saki Mikajima is completely controlled by Izaya Orihara, so when he orders her to fall in love with Masaomi Kida, she does. Even months after they've broken up, she has complete faith that he'll come back to her one day. [[spoiler:Eventually, she chooses Masaomi over Izaya and the two leave town together.]]
** Speaking of Izaya, he constantly crows about how he loves the human race (except for Shizuo), but not humans as ''individuals''. He often [[{{Troll}} perpetuates cruel games]] that have no purpose besides letting him watch people run around in a panic.
** The [[EvilWeapon demonic blade]] Saika is intelligent and desperately loves humanity. Apparently she once loved individual humans, but by the time of the story this has twisted into a generic love for the human race. Unfortunately, as a sword, [[WhenAllYouHaveIsAHammer the only way she can demonstrate this love is by cutting people]]. Every time she cuts someone, they are "impregnated" with a child that [[TheVirus shares Saika's love for humanity and starts to cut more people]]. [[spoiler:Saika's current wielder, Anri, is immune to Saika's control due to her lack of ability to love, and uses Saika to stop the children.]] Saika is even more {{Yandere}} than usual for Shizuo Heiwajima, [[BeyondTheImpossible the most ridiculously overpowered human being alive]]. [[spoiler:This causes problems for Anri, who gets some very strange feelings whenever she sees Shizuo.]]
* Lucy's love for [[spoiler:Khota]] in ''Manga/ElfenLied'' drives her to go insane and [[spoiler:murder his dad and little sister]]. She was partially insane before that anyway though. [[spoiler:With her dog being murdered before her eyes, and all.]]
* ''Manga/FruitsBasket'': Kagura Sohma is the sweetest little thing... until something gets between her and Kyo...
* Mayo -- third ''Manga/FushigiYuugi'' OVA. She's so infatuated with Tamahome that she's willing to destroy his world (both literally and figuratively) just to be with him.
* ''Manga/FutureDiary'': Yuno is [[{{Yandere}} singlemindedly devoted]] to Yukiteru. Although it's she was already insane [[spoiler: due to her AbusiveParents]] long before she fell in love with him.
* In ''Franchise/DotHack'' series, Harald's obsession toward Emma Wielant (even after his death) was what caused him to create the beta version of ''The World'', ''Fragment'', both of which are actually [[spoiler:an attempt to create the ultimate AI by studying millions of players]]. Guess the source of the network crises that happen throughout the series...
* Belarus from ''Webcomic/HetaliaAxisPowers'' is described as being relatively cool-headed. That is before she [[StalkerWithACrush fell in love.]] She cornered Russia in a closet, made him cry, and carries knives in her dress to threaten people who get too close to him. Not to mention, [[{{Squick}} he's her brother]].
* ''VisualNovel/HigurashiWhenTheyCry'' has [[spoiler:Shion Sonozaki]]. This does not end well. A more fitting trope for her than {{Yandere}} due to the [[HatePlague cause]] of her craziness.
* ''Anime/{{K}}'''s Fushimi Saruhiko is the most insane character in the whole show ([[spoiler: aside from the Colorless King]]) and all just because he wants [[spoiler: Yata Misaki]] to notice him. It goes so far that he does everything to make [[spoiler: Misaki]] hate him just so he wouldn't be ignored. When he is with SCEPTER 4 he's just a [[DeadpanSnarker very snarky]] and rather cold young man but once [[spoiler: Misaki]] pops up he goes into [[AxCrazy crazy]] [[{{Yandere}} obsessive]] [[AttentionWhore "just notice me"]] mode.
* One of the creepiest examples comes from Minoru Murao's ''Manga/{{Knights}}''. Of all people, [[spoiler: Nina, the cute little girl of the cast]] goes nuts when she assumes that the object of her affection Mist is physically involved with his MsFanservice companion Euphemia. Her response is to [[spoiler: lead a supernatural agent of the CorruptChurch (the same Church that nearly ''burned her at the stake after accusing her of being a witch'') to kill him. She even shoots him in the leg with a crossbow. Her motivation? To ''send his soul to Hell'', where it will be "purified", then ''join him in death so they can be together for all eternity'']]. Keep in mind that this guy ''saved her life'' in the first few chapters, which is why [[RescueRomance she's so hung up on him in the first place]]. This is borderline LoveMakesYouEvil. To her credit, she does eventually realize just how utterly screwed up she was and works to undo her actions.
* ''Manga/KoharuNoHibi'': Koharu in regards to Akira. She stalks him, obsesses over him, and devotes her whole life to him. In Chapter 21 she even told him she would die if he asked her to.
* Gunter from ''Literature/KyoKaraMaoh''. At first, Gunter seems a little like an idiot, or perhaps more like a teenage girl in love. He tends to be rather overprotective of Yuuri, fussing over every little thing and freaking out whenever he goes missing. Supposedly (at least in the manga), Gunter was actually quite an organized and professional man before he met Yuuri.
* ''Manga/{{Loveless}}'': [[spoiler:Seimei]] is known to have [[spoiler:faked his own death, killed, manipulated and {{Mind Rape}}d countless people, abandoned his family, tricked everyone with his seemingly polite nature, and basically controlled Ritsuka's (the main character) life. All because, according to him, he is insecure and wanted to test Ritsuka's love for him]]. [[PaedoHunt Have we mentioned that Ritsuka is only twelve years old?]] [[BrotherSisterIncest And that he's his brother]]?
* ''Anime/MazingerZ'':
** Dr. Hell can be a subversion because he was already quite unstable and troubled before... but when he was in college and fell in love with a cute Japanese exchange student he started behaving obsessively (getting angry if someone dared to spend time with her) and erratically (his grades started slipping because he was too obsessed to study). When he found out she was in love with another person, he flipped out completely and tried to MurderTheHypotenuse by storming into the campus with a shotgun!
** Boss also tended to act in a very dumb, irrational, and even obsessive way when he was in presence of Sayaka or ''[[Anime/GreatMazinger Jun Hono]]''. Sayaka tended to ignore it, but Jun did not appreciate it or find it amusing.
* In ''Manga/{{Naruto}}'', [[spoiler:this is revealed to be the true nature of the Uchiha Clan's curse, crossed over with LoveMakesYouEvil. They do not ''lack'' love; '''''they love too much'''''. When they witness the death of a loved one, it activates the sharingan, literally born out of the hate that was born out of that loss. The deeper they delve into that hatred, the stronger their eyes get, but as a side effect they become hateful, bitter, cynical, and as Sasuke, Tobi, and to a lesser extent, Madara, show us, downright insane. This is why Tobirama Senju, the Second Hokage, considered them a "cursed clan".]]
* ''Anime/NeonGenesisEvangelion'': Gendo is a manipulative schemer who takes the phrase 'you're worth the world to me' to its (insanely) logical conclusion. [[spoiler:He tries to bring about the apocalypse, in fervent belief that this will reunite his mind and soul with that of his wife, Yui.]]
* Shion in ''Literature/No6'' for Nezumi. When Nezumi is threatened, Shion switches from either all-out rage or coldly, completely rational and ''murderous.'' In the novels, [[spoiler:he comes close to strangling a man when he tries to kill Nezumi and declares it to be "punishment"]]. In episode 10, he [[spoiler:murders a guy in cold blood who tried to kill Nezumi]].
* ''Manga/OnePiece'': Boa Hancock badly misinterprets innocuous actions as signs that Luffy reciprocates her love for him. This would seem cute and innocent and not so creepy if she didn't happen to be [[OldMaid pushing thirty]]. Her behavior has an uncomfortable resemblance to a certain RealLife psychological disorder. (Then again, given [[FreudianExcuse all the crap she had been through early in life]], her screws may not have been put in quite tight enough before she met him, anyway...)
* ''Anime/OsomatsuSan'':
** The Sextuplets are this towards Totoko.
** Choromatsu crazily lust after his idol Nyaa, [[CutenessOverload or any other cute girl in that matter]].
** For one episode, ''Nyaa'' is this towards [[spoiler:''Osomatsu'']], much to Choromatsu (as well as everyone else's) despair.
* ''Manga/PandoraHearts'':
** Oz for Alice. He'll do anything for Alice. [[spoiler: Will go temporarily insane after witnessing human!Alice's death. Will tear apart the Abyss and almost Alice herself to get rid of anything that hurts her.]]
%%** Gil for Oz and Vincent for his older brother Gil.
** [[spoiler:Jack Vessalius']] obsessive love for Laci causes him to trigger the events of the entire series. He essentially wants to ''destroy the world'' for the woman he's loved since childhood, because he believes it will ease her loneliness.
* ''Anime/PuellaMagiMadokaMagica'':
** Sayaka Miki's love for a childhood friend is unfulfilled, driving her berserk, [[spoiler: and eventually turning her into a huge mermaid monster]]. Though in her case, her love was ''just'' a catalyst; the poor girl already had SERIOUS issues from long before she was unfulfilled.
** In the ''[[Anime/PuellaMagiMadokaMagicaTheMovieRebellion Rebellion]]'' movie, [[spoiler: Homura's love for Madoka turns her into the devil]].
* ''Manga/RanmaOneHalf'':
** Dr. Tōfū would begin acting bizarrely whenever Kasumi Tendō is around, or even simply ''mentioned.'' This makes him very dangerous as he'll often be in the middle of treating a patient, and once bent Ranma's neck at a ninety-degree angle.
** When first introduced to the series, Rannma's suitors Shampoo, Ukyo and Kodachi conduct their courtships in a relatively calm, normal fashion. As Ranma continues to ignore them, they slowly grow more desperate -- and more extreme. Magic, deception, violence, all of these become legitimate avenues of pursuit towards romantic happiness. Ranma's rivals, meanwhile, enter the series in this state.
* ''VisualNovel/SchoolDays'': Both female leads go axe-crazy over the main character. It gets to the point that they'd happily murder each other in broad daylight, with witnesses, just to be rid of the competition.
* ''Manga/SgtFrog'':
** Tamama is an adorable, shiny-eyed frog alien, but it's a [[{{Kawaiiko}} deliberate act.]] Piss him off by getting ''too'' close with his sergeant Keroro, and he'll usually drop the act and fly into a rage.
** Giroro is the OnlySaneMan who is actually set on conquering the Earth like he was told... but if you think about hurting Natsumi, he'll usually go ''against'' his Earth-conquering orders to save her.
* ''Literature/{{Shimoneta}}'': PlayedForLaughs with Anna, who becomes obsessed with Tanukichi after he accidentally kisses her, which sets off her pent-up hormones. From then on, she relentlessly pursues him around school and [[StalkerWithACrush will even show up at his apartment]], in an attempt to get his "love nectar".
* ''Literature/StrawberryPanic'': Shizuma (aka Etoile-sama) can make Nagisa freeze or even faint just by looking at her a certain way. Typically the character who has this effect on a person is unaware, but Shizuma knows and [[HandsomeLech seems to like doing this]].
* ''Manga/TokyoGhoul'':
** Kanae falls into a broken state due to unrequited love for Tsukiyama and it makes [[spoiler: her]] vulnerable to being mind raped and tortured into insanity by Eto. [[spoiler: She even attacks Kaneki, cuts off his hand, and jumps so that she can die in Tsukiyama's place after confessing her love for him.]]
** [[spoiler: Tooru Mutsuki]] is obsessed with Haise Sasaki, believing their feelings to be genuine love. To this end, they scheme to MurderTheHypotenuse by getting rid of Touka and fill an entire wall with copies of a single photo of her to stab over and over again. They confess to being willing to do '''anything''' to get Sasaki to come back, even though [[spoiler: he's long since regained his memories and returned to his life as Kaneki]].
* Kisshu from ''Manga/TokyoMewMew'' towards Ichigo. He tries to MurderTheHypotenuse in order to have Ichigo for himself and even resorts to trying to [[IfICantHaveYou kill Ichigo]] herself if she refuses his advances.
* ''Manga/TsubasaReservoirChronicle'': The ultimate cause, as both motivation of the villain Fei Wong (who wants to resurrect the technically-not-dead [[spoiler: Yuuko Ichihara]] and also at one point the motivation of the hero (it's crazy due to what they are both willing to ''do'' -- it's [[LoveMakesYouEvil evil]], yes, but also completely fucking bonkers). At a specific point in the backstory the hero, in the madness of love, chose to turn back time so he could save the girl he was in love with. This act ''borked the entire time-space continuum.''
** Since the two series are connected ([[spoiler:as are their heroes]]), this means that love driving people nutso is also the source of ''Manga/XxxHolic''. It is, in fact, the source of the main character, since [[spoiler: he is a duplicate of the Tsubasa hero created when time was fucked up]].
* In ''Manga/VirginLove'', Kaoru believes this based on his [[AbusiveMom mother's]] behaviour and shuns all emotional relationships for that reason. When it finally happens to him too, his lover is willing to accept the CrazyJealousGuy side of him and persuades him to stay together.
* ''Manga/WildFangs'': Inverted. When they have a master, manbeasts will not lose their minds and attack humans, and that bond is based around love ([[LoveAtFirstSight whether they want it]] [[BelligerentSexualTension or not]]). So basically, love makes you sane in this case.
* In ''Anime/YuGiOh'', Pandora/Arkana went mad after the death of his mother and of his lover in the manga. In the anime, after a magic trick gone wrong, he lost his good looks and his fiancée. By the end, he becomes so deluded that he thinks a doll is the real Catherine even after it falls apart in his arms.
* ''Anime/YuGiOhGX'': [[{{Yandere}} Yubel]], [[StalkerWithACrush Yubel]], [[LoveMakesYouEvil Yubel]]. Boy has an overprotective guardian spirit. Boy sends the spirit away hoping to pacify them. Spirit instead runs afoul of the very force they were supposed to protect the boy from and suffers 10 years of torture. Spirit can't understand why the boy they love ''so much'' would let them suffer like this. Driven mad by the pain, spirit can only conclude that love and suffering must actually be the same thing, that way they can dismiss they're torment as just the boy's way of showing them love. Now the spirit is back and wants to [[TheMasochismTango return the favour]], which they do with all the dedication of someone genuinely in love.
* ''Anime/YuGiOhArcV'': Shay Obsidian towards his sister. When she gets kidnapped, he does a lot of dark things to try and get her back, despite evidence that he's attacking the wrong people. Fortunately, he figures this out and turns his attention to the right people.
* ''Manga/{{Yuureitou}}'': Marube was in love with Tetsuo's real mother Onatsu. Now, he lusts after his biological child Tetsuo because of his great resemblance to her. Later we find out he wants to have a BrainTransplant with Tetsuo so he can "become" Onatsu and have sex with his own body. Not only that, if the surgery succeeds he plans to have a child with Tetsuo so he can switch brains with his own children over and over again and thus create an "eternal love" with Onatsu by forever living on in a body with both her and his blood.
* ''Manga/{{Zetsuai|1989}}'': When Izumi was five, his mother discovered his father was cheating on her and murdered him in front of Izumi so that she could "possess him completely". Then there's the {{Yandere}} fan Eri, who [[spoiler: tries to murder Kouji at his farewell concert]]. That's without even mentioning the multiple examples of Kouji being driven to despair, self-mutilation, or generally self-destructive behaviour because of his love for Izumi -- who is understandably a bit freaked out by all this. At first. After a while, he starts to join in...
[[/folder]]

[[folder:Animation]]
* In ''[[Animation/KihachiroKawamotoShorts Dōjō-ji Temple]]'', Kiyohime's crush on the young Buddhist monk Anchin makes her crazy, to the point of HulkingOut as a dragon and killing him.
[[/folder]]

[[folder:Comic Books]]
* ''ComicBook/{{Asterix}}'': Parodied in ''Asterix the Legionary'', where Obelix starts acting extremely strange because he's in love with Panacea, which is soon diagnosed by the other villagers. Later, after their terrible behavior has caused a centurion to become extremely overstressed and prone to collapsing sobbing onto other soldiers, they keep assuming he's in love too. This seems at first to be Obelix's {{Cloudcuckoolander}} personality, but it becomes a RunningGag with every other character who witnesses his freak-outs assuming the same thing.
* ''ComicBook/{{Chassis}}'': Twist is a cheerleader so obsessed with her favourite Aero-run driver that she is willing to do whatever it takes to ensure he wins: sabotaging, and even killing, his rival racers.
* ''ComicBook/GreenLantern'': The Star Sapphire Corps' power is fueled by love. Originally [[WithGreatPowerComesGreatInsanity the power was consolidated into a single person]], with the result that individual tended to go crazy.
* ''ComicBook/LegionOfSuperHeroes'': In ''[[ComicBook/Superboy1949 Superboy and the Legion of Super-Heroes]]'' issue #204, Brainiac misses ComicBook/{{Supergirl}} so badly that he builds a Kara robot in his sleep, programming her to run away with him.
* ''ComicBook/Robin1993'': Tim Drake attracts quite a few seemingly delusional individuals who don't seem to realize that their romantic and sexual interest in him does not equal a loving relationship when he doesn't find them romantically appealing and would like them to leave him and his girlfriend Stephanie Brown alone. Some of these young women are otherwise heroic like his ComicBook/YoungJustice teammate Secret.
* ''ComicBook/{{Spook}}'': Smilkov's motivation to create ghosts was his love for his daughter and his desire to see her again, causing him to gradually lose touch with reality.
* ''ComicBook/SwampThing'': "My Blue Heaven" has Alec trapped on an alien world all alone. He uses his plant-controlling powers to create clones of himself... and then, in a moment of temptation, creates his love Abby. After spending another day creating an entire populated world, he accidentally creates a [[Characters/HellblazerJohnConstantine John Constantine]] who warns him how crazy he's become. It doesn't help that Alec can't ignore the fact he can't get Abby's smile just right, and he goes mad when his Abby-self responds "All love... is madness."
* ''ComicBook/WonderWoman2006'': Alkyone's secret love and intense loyalty to Hippolyta and the Amazon way of life led her to commit increasingly immoral actions to the point she became set on destroying anything that she felt threatened the "proper" Amazon way of life, or which might change her queen.
[[/folder]]

[[folder:Fan Works]]
* At one point in the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic ''Dawn of a New Day'', Twilight Sparkle becomes ''so'' pent up over her [[CanNotSpitItOut inability to confess her feelings to Rainbow Dash]] that she enters a delusional state (complete with false memories) and spends several hours believing that she has and they are happily dating. Unlike other examples of this trope, she doesn't engage in any sort of violent or disturbing behavior and just acts more affectionate towards Rainbow Dash. Upon snapping out of it later, Twilight is left feeling guilty and sad. [[spoiler:Fortunately, her behavior helps Rainbow Dash to realize that she's starting to develop feelings for Twilight.]]
* Germany's and Japan's jealousy and subsequent hatred for each other over Italy in ''[[https://www.fanfiction.net/s/11886910/1/Gankona-Unnachgiebig-Unità Gankona, Unnachgiebig, Unità]]'' grew to the point they started beating the crap out of each other. It would have been a [[MurderTheHypotenuse fight to the death]] if Italy had not interfered.
* In ''Fanfic/ThousandShinji'':
** When Asuka [[spoiler:lost Shinji temporarily,]] she went nuts. She wrote "Please, go back! I need you!" on his bedroom's walls and she went on a vigilante killing spree, murdering thugs and rapists to endure her pain.
** When Shinji lost [[spoiler:Asuka and Misato]] the narration explicitly tells that his sanity shattered.
* ''Fanfic/{{Rules}}'': [[spoiler:Even after losing her memories of the Death Note]], Misa is ''still'' obsessed with Light, to the point of delusion. Once Light breaks up with her, she goes into [[CrazyJealousGuy Crazy Jealous]] StalkerWithACrush mode and harasses him to take her back. Even after it's made clear that Light is ''not'' getting back together with her, she remains convinced that he will return to her after the "American whore" (Charlie) breaks his heart.
* ''Fanfic/AAMLDiamondAndPearlVersion'': When a wild Phione crushes hard on Dawn's Buneary, Ash's Pikachu (who, unlike canon, is actually reciprocating her feelings for him) challenges it to a battle, where he goes berserk, seriously injuring Phione, and only stopping his relentless assault when Buneary gets in the way, forcing him to veer to the side and crash into a pole to avoid hurting either of them.
* ''Fanfic/TheyllNameACityAfterUs'' a lovesick Apollo goes and kidnaps Percy Jackson, while knowing that Percy's father, the god Poseidon will be furious and instigate a DivineConflict.
[[/folder]]

[[folder:Films -- Animation]]
* In ''WesternAnimation/{{Hercules}}'' it's portrayed quite positively, as love is what drives Megara to [[spoiler:sacrifice herself to save Herc]], and Herc to return the favor by [[spoiler:demanding that Hades take him in her place, which proves his true heroism and restores his godhood, saving them both]].
-->'''Megara:''' People always do crazy things when they're in love.
* In ''WesternAnimation/TheSteamEnginesOfOz'', it was losing his love Nimmie Amee that caused the Tin Man to go crazy with grief and remove his heart, and gradually become a TinTyrant: seeking to destroy both magic and the munchkin race as the two factors he considers responsible for her death.
[[/folder]]

[[folder:Films -- Live-Action]]
* ''Film/BitterMoon''. What starts out as a beautiful love story between a man and a woman ends up as two people who have destroyed each other and themselves.
* In ''Film/TheConIsOn'', one of the reasons PsychoLesbian Irina pursues Harry and Peter across the Atlantic is that she is still in love with Harry, and sees their losing her money as the perfect excuse to kill Peter and force Harry to come back to her.
* Creator/JeremyIrons in ''Film/{{Damage|1992}}'' if you consider travelling from London to Paris just to spy on someone crazy (which most people presumably would).
* In ''Film/TheDuff'', one of the first signs that Wesley is falling in love with Bianca is that he punches someone out to defend her honor. Apparently now the other jocks think he's on steroids.
* In the classic play and film ''Film/TheDybbuk,'' Khonnen, a poor student, and Leye, a rich merchant's daughter, fall in love. But her father makes her marry a rich man's son. So Khonnen studies the Kabbala, and -- using what is effectively black magic -- dies and becomes a spirit who takes over Leye. (At the wedding, he makes her shout to the groom, "You are not my bridegroom!")
* ''Film/ElectricDreams'': Edgar falls madly in love with his owner Miles' neighbor, Madeline. This escalates into pure obsession with Edgar lashing out at Miles for not letting him see her or tell Madeline that it was Edgar who made the music she loved so much. [[spoiler:He then [[DrivenToSuicide short-circuits himself]] to [[IWantMyBelovedToBeHappy let Miles and Madeline be together]].]] [[JustifiedTrope Justified]] somewhat in that Edgar is a computer, and thus [[AndIMustScream has problems trying to process his own emotions]] and understand how love ''actually'' works.
* ''Film/TheEnglishPatient''. The title character, his lover, and her husband were already all a little crazy, but love seems to really bring it out.
* ''Film/FantasticBeastsTheCrimesOfGrindelwald:'' [[spoiler: Queenie Goldstein falls in love with Jacob Kowalski, and is desperate to marry him. While he ''does'' reciprocate, the reason he refuses to marry her is that it would mean the MACUSA would throw her in jail. She starts to become irrational and possessive, going so far as to enchant him and drag him into the UK to get married. When Jacob thinks she's crazy for this, she leaves in a huff for Paris. [[FromBadToWorse Then she's persuaded to join Grindelwald's cause]] because she's naive (or desperate) enough to think that his vision of wizards living openly will mean that she and Jacob can marry - even though it's obvious from the subtext in his speech that he thinks of non-magical people as less than human. When Jacob (who was with her at the speech) begs her not to join Grindelwald, it doesn't take]].
* Alexandra "Alex" Forrest in ''Film/FatalAttraction''. She becomes increasingly unhinged following her one night stand with Dan, and threatens to kill herself if he should leave. It all culminates in her boiling the family's bunny and attempting to murder Dan's wife.
* ''Film/TheHole'': [[spoiler:In order to win the affections of Mike, Liz arranges for them to be locked underground for nearly two weeks. This results in the death of Frankie, Geoff, and Mike, and ultimately Martyn, who Liz murders to cover up her crimes]].
* In ''Film/TheLovedOnes'', Lola has Brent kidnapped and tortured [[DisproportionateRetribution for not going to the prom with her]].
* ''Film/NightSchool1981'': The motivation for the killer. [[spoiler:When Eleanor learns she is pregnant with Victor's child, she starts eliminating everyone she sees as a threat to her new family. This includes all of the women Victor has been unfaithful to her with, and anyone who threatens Victor, such as the Dean, who threatens to fire him.]]
* Adele Hugo in ''Film/TheStoryOfAdeleH''. She always had schizophrenia, but her obsession with Lieutenant Pinson causes her to act out in increasingly troubling ways, all of which she justifies due to what she assumes to be their grand love affair. He wants nothing to do with her, especially when she begins directly and indirectly sabotaging his personal life due to her unhinged antics.
* It's not romantic love, but Loki's love for his [[spoiler: adoptive]] father and home (and by extension, mother and brother) in ''Film/{{Thor}}'' and his desire to be loved as a son on par with Thor drives all his schemes and ambitions (and the plot). He eventually becomes a (literal) WoobieDestroyerOfWorlds, and when Thor calls him out on his actions, his composure deserts him.
-->'''Thor:''' This is madness!\\
'''Loki:''' Is it madness? Is it? ''IS IT!?''
* In ''Film/ThrowMommaFromTheTrain'', this line is used, word for word, as the last line of Creator/BillyCrystal's book. "Hate makes you impotent, ''love makes you crazy'', somewhere in the middle you can survive."
* In ''Film/XMenOriginsWolverine'', Victor did '''not''' take his brother James leaving him for a life of peace well... not in the least.
[[/folder]]

[[folder:Literature]]
* Lydia in ''Caught In The Act'' by Peter Moore in regards to Ethan.
* Vlad Tepes in ''Literature/CountAndCountess''. To get to Elizabeth Bathory's time period, he has to somehow outlive his natural lifespan. The measures he takes become increasingly more frantic and sadistic.
* ''Literature/TheDarkDescentOfElizabethFrankenstein'': In this retelling of ''Literature/{{Frankenstein}}'', Victor begins his experiments of triumphing over death after he almost loses Elizabeth to illness. It quickly becomes a case of LoveMakesYouEvil as well.
* In the ''Literature/DeliriumSeries'', this trope is why love is said to be the reason for all of humanity's past ills. As a result, it is classified as a disease, amor deliria nervosa, and at 18 every person is required to get a surgery to cause them to be unable to love.
* ''Literature/TheDresdenFiles'':
** Several characters suspect love motivated Aurora and Mab's actions and are visibly disturbed by the notion. Maeve in particular implies that it is very dangerous for powerful magical beings of the Never Never to be in love. It twists their worldview and throws them completely out of their comfort zone. [[spoiler:She is later revealed to have been lying.]]
** Subverted in ''Literature/GhostStory''. Molly's sudden descent into mental illness is attributed to the death of [[spoiler:Harry,]] the man she loved. The actual cause is [[spoiler:her guilt over enabling Harry's suicide]].
* ''Literature/TheEmpiriumTrilogy'': Corien the Undying Emperor has spent a ''lot'' of time thinking about Rielle and his love for her. It gets to the point where he can't focus on much else. By the time he has [[spoiler:Eliana in his clutches]], the need to see his long lost love again trumps even his desire for resurrection.
* ''Literature/TheFaerieQueene'':
** Timias temporarily loses his sanity, secluding himself in a cave, when Belphoebe thinks he cheated on her. Ironically, Belphoebe realizes how much he loves her when she finds him in this state.
** Also Marinell when he realizes Florimell is being held prisoner by Proteus, to the point where Cymodoce [[MyBelovedSmother relents]] and gets Neptune to intervene.
* Bellatrix Lestrange from ''Literature/HarryPotter'' could qualify for this, seeing as she's utterly obsessed with her master in an... "unhealthy way". Although she already had a husband, WordOfGod stated that Voldemort was her true love.
* {{Invoked|Trope}} by Katniss and Haymitch at the end of ''Literature/TheHungerGames''. She needs the Capitol to think she pulled the stunt with the berries because she was crazy in love with Peeta, and not because she was trying to be rebellious and undermine the Games.
* OlderThanDirt: ''Literature/TheIliad'' is about UsefulNotes/TheTrojanWar, which was started because Paris saw Helen of Troy, the WorldsMostBeautifulWoman, and had to have her. Unfortunately for him, she already had a husband, Menelaus of Sparta, and when he found out what happened, he rallied the city-states of Greece to make war on Troy. Total survivors? A handful: Menelaus and Helen made it back with an unstated number of followers, as did Odysseus (after he had his own GaidenGame, ''Literature/TheOdyssey''), but ''literally everyone else died'': all the Achaeans on the thousand ships, and everyone in Troy as well. (And, keep in mind, "Love Makes You Crazy" is the ''flattering'' interpretation of Paris's actions; "LoveMakesYouEvil" is just as applicable, as is "DownfallBySex.")
* Edmund Bertram, previously the OnlySaneMan at ''Literature/MansfieldPark'' save for the heroine, falls blindly in love with Mary Crawford at the expense of all higher reasoning and discernment.
* In ''Literature/OnlyTheRingFingerKnows'', Yuichi Kazuki is known at Wataru Fujii's school for being kind and polite to everyone he meets, despite possessing ridiculous amounts of [[{{Bishonen}} beauty]], wealth, and talent. Yet whenever Wataru crosses paths with him, Yuichi never fails to be [[{{Jerkass}} snarky and insulting]] towards him. Karin, Wataru's sister, comments that this must mean that Yuichi either ''really'' hates him... or ''really'' likes him. Guess which one it turns out to be.
* Played with in William Faulkner's ''Literature/ARoseForEmily''. The townsfolk regard high-born Emily running around with a workman to have lost her head in love. Her later actions prove she was ''definitely'' cracked, but she might have been cracked well before falling in love.
* In Creator/RobertEHoward's "Literature/ShadowsInZamboula," after the woman tells him her love went mad and attacked her, Franchise/ConanTheBarbarian tells her that her beauty could do that; she denies it; he was drugged.
* ''Literature/ASongOfIceAndFire'':
** Crazy Lysa Arryn is largely motivated by her love for Littlefinger, [[MagnificentBastard who uses this to his advantage]]. As implied by his actions (ie, [[spoiler: kicking off a continent-wide war]]), Littlefinger himself has been left [[{{Yandere}} mentally unstable]] by his [[AllLoveIsUnrequited unrequited love]] for Lysa's sister, Catelyn Stark.
** Ser Loras Tyrell completely loses his mind after he discovers [[spoiler:that his lover King Renly Baratheon has been murdered]].
--->'''Varys''': It's said the Knight of Flowers went mad when he saw [[spoiler:his king's body, and slew three of Renly's guards in his wrath, among them Emmon Cuy and Robar Royce]].
** Daenerys Targaryen's khalasar naturally think that she has gone off the rails after her husband's death and son's stillbirth, when she intends to walk into Drogo's funeral pyre. They aren't moved when she gives a RousingSpeech about leading them to triumph over their enemies, with some outright saying that they don't take orders from a crazy woman. Then she hatches three dragons, and everyone immediately bend the knee.
* Richard and Jessamyn in ''Literature/{{Swordspoint}}'', as well as Richard and Alec and basically everyone else in the book and its sequels to a lesser extent.
* The Warlock from ''Literature/TheTalesOfBeedleTheBard'' tries not to love by removing his own heart. When he tries to love again...
* In ''Literature/WarriorCats'', there is Ashfur. After being dumped by Squirrelflight, he [[spoiler:attempts to kill her father, and later her (adopted) children]], to make her feel the same pain he did. [[spoiler:When Jayfeather sees Ashfur in the feline equivalent of heaven, he protests that Ashfur attempted murder, and the response he's given is "Ashfur's only crime was to love too much."]]
* The subtitle of ''Literature/WutheringHeights'' could be "Love Makes You Crazy"... "[[LoveMakesYouEvil and Evil]]."
[[/folder]]

[[folder:Live-Action TV]]
* Bus Driver Stu Benedict, of ''Series/TheAdventuresOfPeteAndPete''. Almost every time we see him, he's just been dumped by his on-and-off girlfriend Bus Driver Sally Knorp, and he reacts increasingly poorly. On various occasions, the break-up has caused him to spend the bus ride home giving a six-hour tour of important locations in his and Sally's life; go insane upon hearing "If You're Happy and You Know It"; and drive to the Arctic, tattoo her name to his chest, strap himself to an iceberg and drift out to sea (though we don't know if he went through with that last one. He shows up again afterwards, so he probably didn't.)
* Characters of ''Series/AsTheWorldTurns'' often go to pretty extreme extents for their family and love interests. This is actually a standard trope of ''many'' {{Soap Opera}}s, usually combined with DerailingLoveInterests as heretofore normal, decent people, usually women, go completely off the deep end in an effort to hang onto or seek revenge on former love interests.
* A main theme of ''Series/{{Battlestar Galactica|2003}}'' seems to be "love makes you batshit".
* ''Series/BuffyTheVampireSlayer'':
** Don't ever hurt or kill one of Willow Rosenberg's girlfriends, lest you want to end up [[spoiler: flayed alive]].
** "Love makes you do the wacky." -- said twice in the episode "Some Assembly Required". First time by Willow, in reference to Angel's jealous behaviour toward Xander, and then by Buffy, about why a classmate revived his brother as a sort of Frankenstein's monster.
** In a later episode, it appears this is happening with Dawn when she falls for a jock. It turns out, there was a spell involved and hilarity ensues. At the end of the episode Dawn expresses embarrassment over all the crazy things she did; big sis tells her to just wait till she falls in love for real.
** When vampire Spike falls for Buffy, he goes on a long rant over how even he knows [[DatingCatwoman their relationship]] is SickAndWrong and how bonkers his unrequited love is making him.
* Cole in ''Series/Charmed1998''. It may have also [[LoveMakesYouEvil made him evil]], [[HeelFaceRevolvingDoor again]], but then again [[BadPowersBadPeople it could have been all the demonic powers he absorbed.]] Then again again, he absorbed all those powers in order to be able to return to the mortal plane to be with her again.
* ''Series/TheCoroner'': The motivation for the murder in "The Deep Freeze". [[spoiler:A factory manager is in love with her boss and convinced that he feels the same way about her. When he marries a GoldDigger BlackWidow and then plans to sell the company, she snaps and kills him in such a way as [[FrameUp frame the wife for murder]].]]
* Played with throughout ''Series/CrazyExGirlfriend''. The second season theme song namedrops this trope, and Rebecca's love for Josh (as well as her later love interests) drives a lot of her impulsive behavior, but many episodes deconstruct this by showing that even without any man in the equation, she still has a lot of unresolved trauma and mental illness to address.
* In ''Series/DesperateHousewives'', Edie, who up until that point was a casually promiscuous woman who was more bitchy and snarky than actually crazy. Once she starts having a liking for Carlos, suddenly she starts going completely insane and even attempts suicide just to get his attention.
* ''Series/DoctorWho'':
** [[Recap/DoctorWhoS28E11FearHer "Fear Her"]]: Isolus normally have company in the billions, all mutually sustaining each other with their love, so when one ends up isolated and deprived it goes around the bend.
** Rory loves Amy. ''A lot''. Enough that he [[spoiler: guards her sleeping body for 2,000 years without leaving]].
*** Although that was arguably more like love keeping him sane.
** River loves the Doctor. ''A lot.'' Enough that she [[spoiler:almost destroys time in order to save him]].
** The Doctor loves Clara Oswald. ''A lot.'' Enough that he [[spoiler:nearly destroys all of time and space in a desperate gambit to prevent her death, which he witnessed, from ever happening]], in the process becoming TheUnfettered and a WoobieDestroyerOfWorlds.
* Often a case with patients in ''Series/{{ER}}''. After the death of his granddaughter caused by a crazy bomber who happened to be taken into the same hospital, the man who was previously shown to be friendly and calm went and strangled the guy to death. When Gates's best friend's wife finds out he was dating Neela, she got drunk, went to the ER, and flew into a rage at both Gates and Neela. In another instance, when a man found out his girlfriend was dying, he brought in a gun and threatened the doctors working on her to continue working on her and bring her back, even though her heart had stopped.
* In ''Series/{{Farscape}}'' John tells Aeryn she's the reason he's crazy. Of course, all that MindRape by evil guys might have something to do with it. A bit of FridgeBrilliance here - John got put in the Aurora chair and was subjected to MindRape because he snuck into that base to help find a cure for a dying Aeryn.
* In ''Series/{{Flashpoint}}'', the team regarded Valentine's Day as one of the toughest days with plenty of calls. Three cases are shown: a suicidal widower whose wife died on Valentine's, a mother taking her daughter's manager in a strip club hostage, and a recently fired man who was madly infatuated with his boss.
* ''Series/GameOfThrones'': Daenerys resorts to forbidden blood magic to save Drogo's life in "Baelor". Subverted in "Blood and Fire" — everyone thinks she's killing herself by walking onto Drogo's funeral pyre, but in reality she's hatching her dragons.
* In ''Gunpowder, Treason & Plot'', Bothwell has this to say to Mary, Queen of Scots:
-->'''Bothwell''': I would kill every man in Scotland for you, every child. ''That'' is love.
* ''Series/TheHauntingHour'': The Valentine's Day episode "Terrible Love" had Brendon go insane when Maggie begs Cupid to shoot Brendon with another love arrow. Cupid initially objects as one love arrow is enough, and more than one causes jealousy, greed, and possessiveness (which Cupid has seen too much of in his time as the god of love). Maggie doesn't care, and ends up dealing with her crush who has turned clingy and deranged.
* ''Series/{{Hellcats}}'' plays with the trope; while Vanessa and Red have genuinely loved other people, they haven't felt what Red calls "that cosmic pull" with anyone but each other. As Red says:
-->'''Red''': There wasn't... that 'cosmic pull'. You know, that crazy-ass feeling that makes you want to cry at [[SillyLoveSongs stupid love songs]] and [[NoodleIncident run around hotel lobbies butt-naked]].
* ''Series/ICarly'':
** Ms. Ackerman wants to know where Spencer is for every minute of every day, and actually keeps logs on when he doesn't answer his phone.
** In a platonic love ([[HoYay/ICarly or not?]]) kind-of way, Sam got really, really mad when Carly was harassed by a bully in "iMake Sam Girlier".
* ''Series/InterviewWithTheVampire2022'': By [[Recap/InterviewWithTheVampire2022S1E7TheThingLayStill the Season 1 finale]], Lestat de Lioncourt is no longer thinking rationally when it comes to his boyfriend Louis de Pointe du Lac, with Lestat somehow deluding himself that Louis will finally love him with all of his heart by severely restricting the latter's freedom. Lestat now treats Louis -- a black man who ''deeply'' resents being oppressed by white society -- as his PropertyOfLove and keeps him confined in a GildedCage. Any sensible person would recognize that reducing Louis to a mere love slave would cause him to loathe Lestat even more (Louis has already contemplated suicide as a means to escape from Lestat's DomesticAbuse). Louis' lack of personal autonomy is further worsened when Lestat (who's promiscuous) suddenly foists a VampiresHarem structure upon their relationship without consulting Louis (who's a monogamist) beforehand -- Lestat clearly doesn't care about Louis' opinions or feelings on the matter, and is essentially behaving like a slave owner whose word is law. If [[MasculineFeminineGayCouple Louis being forced into the position of Lestat's]] [[GenderInvertedTrope male]] TopWife wasn't bad enough, Lestat also intends to [[OffingTheOffspring murder their vampire daughter Claudia]] (whom Louis adores) because [[JealousParent he views her as an impediment to possessing the entirety of Louis' love]]. It's no wonder that Louis is willing to kill his psycho lover in order to regain his freedom and keep Claudia safe, which is the complete opposite of what Lestat wants.
* In ''Series/{{Jekyll}}'', [[spoiler:Tom's mother explains in the final episode. "People think that Hyde is rage. Or hate. Or greed. Or lust... But Hyde is far worse. Hyde is love -- and love is a psychopath."]]
* ''Series/MidsomerMurders'': The motive in [[spoiler:"[[Recap/MidsomerMurdersS18E3 Breaking the Chain]]"]]. The killer sets out to eliminate everyone they see as standing between their lover and success; including his brother.
* ''Series/NoahsArc'': [[spoiler:Dre goes to crazy lengths to get Alex out of the picture so he can be with Trey, setting up a BatmanGambit to turn Trey and even Alex's friends against Alex. It's bizarre even by TV drama standards]].
* Chris Keller in ''Series/{{Oz}}'' for Beecher, and Ryan for Dr. Nathan. Also overlaps with LoveMakesYouEvil.
* ''Series/PersonOfInterest'': In addition to a few VictimOfTheWeek examples, there's the clear and terrifying [[SanitySlippage breakdown]] of [[spoiler: Root's]] [[HeelFaceTurn recently discovered morality]] after [[spoiler: Shaw is [[UncertainDoom either abducted or killed]] by Decima]].
* Nearly everyone in ''Series/PushingDaisies'' is a victim of this, and it's not always even romantic love.
* In ''Series/{{Skins}}'', Effy's love for Freddie ''literally'' makes her crazy: she's eventually sectioned for either schizophrenia, depression, or both.
* It doesn't just turn you crazy in ''Series/{{Supernatural}}'', it makes you a suicidal martyr willing to sacrifice yourself for the one you love.
%% ** Season 7, Episode 8. Enough said.
* ''Series/{{Torchwood}}'': There's [[HotterAndSexier a lot of love]]… and [[DarkerAndEdgier a LOT of insanity]].
* ''Series/TheVampireDiaries'': Damon has played with this trope as well as LoveRedeems, LoveMakesYouEvil, and LoveMakesYouDumb at some point during the show.
%%* Shane Walsh in ''Series/TheWalkingDead2010''.
* ''Series/WizardsOfWaverlyPlace'': Harper, before her much needed CharacterDevelopment. This could also be said of Justin, ever since "Wizards vs. Vampires" -- and is specifically stated as the reason why Justin didn't dump Rosie when he found out that Rosie was an Angel of Darkness.
[[/folder]]

[[folder:Music]]
* Steven Curtis Chapman explains in "Something Crazy" that you don't know what love is until it makes you do something crazy. He mentions a street corner preacher, a humanitarian in Uganda, and the biggest one of all, Jesus Christ.
* Music/BrunoMars seems to be fond of this trope.
** The song "Grenade" may sound upbeat. But when you listen to the lyrics, it's kinda disturbing. Voluntarily giving your life [[DoggedNiceGuy for someone that no longer loves you?]] [[StupidSacrifice That's not sweet. That's sick.]]
*** In the music video, he drags a piano around with him to her house. While it seems strange at first, observe how the piano could stand for the suffering for not being loved by her anymore. He reaches her house, to see her kissing another man. Depressed, he leaves, standing in front of a railroad crossing, playing the piano. [[spoiler: Then, a train hits him, and he dies.]]
** A more literal example of this trope, the song ''Talkin' To the Moon'' takes a similar approach to "Grenade", but instead, it depicts a man who has been driven stark raving mad instead of being DrivenToSuicide over a relationship. Here, the person is revealed to be [[TitleDrop talking to the moon]]...pretending the moon is his once significant other.
*** While the tone of this song is LighterAndSofter when compared to ''Grenade'' (though the music [[LyricalDissonance sounds sadder]]), imagine if you broke up with your significant other. You no longer have any interest in him/her. You've completely moved on and wish to find someone else. Meanwhile, that person you dumped is left emotionally compromised by your relationship with him/her, that he/she is driven mentally insane...to the point where he/she ends up talking to a figment of his/her imagination: You. He slowly deteriorates under his own delusions of being in love with you while you don't even know about it.
** "Voices in My Head" is the most literal example of this.
* Music/TaylorSwift:
** "The Way I Loved You."
--->You're so in love that you act insane\\
And that's the way I loved you
** "My mother accused me of losing my mind" in "Dear John".
** "Don't Blame Me."
--->Don't blame me, love made me crazy\\
If it doesn't, you ain't doin' it right
* Music/{{JoJo}} says herself when singing about her "Boy Without A Heart"
-->So why am I here at your door, at your door.\\
If I was sane, I'd take my crazy behind,\\
And get back in my BMW
* In ''Music/{{Pink}}'s'' "Please Don't Leave Me" she slowly goes insane when her boyfriend attempts to leave her.
* Music/ThePolice's "Next to You". Love makes you sell your possessions and contemplate theft, apparently.
* The ''Therapy?'' song ''[[https://www.youtube.com/watch?v=rdPGUyfwQL4 Dopamine, Seratonin, Adrenaline]]'' outright links love, mental illness and drug addiction as per the Real-Life example.
* "Love Makes You Crazy" by Mike Batt. (Part of an SF concept album where the future society has [[SillyRabbitRomanceIsForKids outlawed]] love.)
* "I Drive Myself Crazy" by Music/{{NSYNC}} has the chorus "I lie awake/I drive myself crazy/drive myself crazy/thinking about you," with the music video of the band in a sanitarium.
* "Lose My Mind" by Music/BrettEldredge:
-->You make all my screws come loose \\
Got me perfectly confused \\
Always find a way to mess me up and drive me wild \\
I love the way you make me lose my mind \\
I feel the walls closing in inside this padded room \\
Only good thing about it is I'm locked in here with you \\
I'm always watching you, wondering what you'll do next \\
But my favorite part about it is, is I always have to guess
* "She Drives Me Crazy" by Fine Young Cannibals:
--> She drives me crazy \\
Like no one else \\
She drives me crazy \\
And I can't help myself
[[/folder]]

[[folder:Pinball]]
* A platonic example: in ''Pinball/WhoDunnit1995'', Butler's loyalty for Victoria is the only reason he puts up with her constant abuse. What's more, he cares so much about her that he [[spoiler:enables her BlackWidow tendencies and attempts to murder Tex after he threatens her]].
[[/folder]]

%%[[folder:Pro Wrestling]]
%%* Many of Wrestling/RandySavage's angles that involve Wrestling/MissElizabeth invoke this trope.
%%* And don't even get us ''started'' on [[Wrestling/AJLee AJ]].
%%[[/folder]]

[[folder:Theatre]]
* ''Theatre/LittleShopOfHorrors'': More out of desperation rather than malice, Seymour wanted to win Audrey's heart more than anything in the whole world, and [[ManEatingPlant Audrey II]] manipulates him to its advantage to get more blood.
* A common element in Creator/WilliamShakespeare's pieces:
** Polonius is initially convinced that Theatre/{{Hamlet}}'s recent wacky behavior is caused by his love for Ophelia. His attempt to set up a sting operation to prove his theory ends with an apparently-deranged Hamlet ranting that he'd never loved Ophelia and that she'd best go be a nun [[GetTheeToANunnery (or a whore, depending on your interpretation)]]. So much for that idea.
** In ''Theatre/AMidsummerNightsDream'', Helena is aware that her passion for Demetrius is wacked out even before she betrays Hermia and Lysander to him.
--->''And as he errs, doting on Hermia's eyes,\\
So I, admiring of his qualities:\\
Things base and vile, folding no quantity,\\
Love can transpose to form and dignity:\\
Love looks not with the eyes, but with the mind;\\
And therefore is wing'd Cupid painted blind:\\
Nor hath Love's mind of any judgement taste;\\
Wings and no eyes figure unheedy haste:\\
And therefore is Love said to be a child,\\
Because in choice he is so oft beguiled.''
** Theatre/{{Othello}} insists that his flaw is that he "loved not wisely, but too well." Of course, being a HorribleJudgeOfCharacter doesn't help either.
* In ''Theatre/ThrillMe'', this trope is Nathan's explanation for why he committed a series of crimes, including murder.
-->But you've asked a simple question\\
And I've told you why\\
It wasn't on a dare or on a whim\\
It's hard to comprehend now\\
That the reason why\\
Was simply that I went along with him\\
[[/folder]]

[[folder:Video Games]]
* In ''VideoGame/ArcRiseFantasia'', [[spoiler: Adele]] takes a dive off the slippery slope to evil and onto the crazy train when she finds out that she's an [[ChildhoodFriendRomance Unlucky Childhood Friend]]. NiceGirl to {{Yandere}} [[TheVamp Vamp]] in about five minutes or less!
* In ''VideoGame/CityOfHeroes'', the [[BrainInAJar Clockwork King]] is hopelessly in love with Penelope Yin, a young [[PsychicPowers psychic]]. His love for her manifests in the [[ClockworkCreature Clockwork Army]] which he uses to [[WellIntentionedExtremist keep her safe from heroes]] and other boys. His [[MirrorUniverse Praetorian counterpart]] [[OurGhostsAreDifferent Metronome]] has the same feelings for his world's Penelope. [[spoiler: He wants to [[UnwantedRescue rescue]] her from Mother Mayhem's mental hospital by transferring her soul into a [[SuperPoweredRobotMeterMaids Praetorian Clockwork]] body.]]
* In ''VideoGame/HalfMinuteHero'', the so-called "Beautiful Evil Lord" went completely insane after learning that his beloved Millennia was kidnapped by an EvilSorcerer named Noire, and vowed to cast the spell of [[EarthShatteringKaboom destruction]] because he felt that [[IfICantHaveYou a world without Millennia wasn't worth living in]]. You, the Hero, come along and try to calm him down by beating up Noire and returning the Evil Lord's girlfriend to him. You can also attempt to try and tackle him head-on first to [[GetAHoldOfYourselfMan snap him out of it by force]] (and you get a CosmeticAward title for doing so), but because the Evil Lord is hopped up on equal parts adrenaline and angst, you'll get beaten repeatedly unless you take enough time to Level Grind to the point where you can face him on equal footing.
** And he goes insane again later when Millennia's transformation into a bat suddenly worsens.
* The CuteEmUp game ''VideoGame/HarmfulPark''. The BigBad's diary at the ending reveals that the BigBad wasn't evil before, and attempted to create a place called Heartful Park for the heroines' single mother. However, he fell in love with her so deeply that it drove him mad, and turned that park into [[TitleDrop "Harmful Park"]].
* Viego, better known as The Ruined King, from ''VideoGame/LeagueOfLegends''. In his original life, he was obsessed with a peasant girl known as Isolde. Shirking all his kingly duties to fawn over her. And when she died, it just got worse. Viego's botched attempt to revive her in the Waters Of Life gave birth to [[DeathWorld The Shadow Isles]]. And now he's even ''crazier'', an obsessed and very powerful specter who will ruin the world if it means he gets her spirit back.
* This is how the original ''VideoGame/BloodOmenLegacyOfKain'' begins: When Nupraptor the Mentalist, guardian of the Pillar of the Mind, discovers that his lover Ariel, guardian of the Pillar of Balance, has been murdered in cold blood, he goes completely insane and secludes himself in his mountain retreat. Which wouldn't be so bad by itself, except he has a mental link with all the other Pillar guardians, who all become corrupted by his madness in turn. [[spoiler:Including Kain while he was still in the womb.]]
* Salome, the former disciple of ''VideoGame/MakaiKingdom'''s Overlord Zetta, whose crush on said Overlord goes into this trope on the ''deep'' end. [[spoiler:She willingly started channeling her own mana into Zetta without his knowledge or consent, slowly killing herself to make him stronger.]] Upon learning that Zetta has been cursed by The One and has only two days to live, Salome, who is dying herself, then tries to make Zetta marry her so they can [[TakingYouWithMe die together]]...by ''crashing her own netherworld into Zetta's'' and eventually provoking him into killing her.
* [[TheDragon Craft]] of ''VideoGame/MegaManZero4'' is either this or LoveMakesYouEvil. He joined [[BigBad Dr. Weil]]'s army only so that he can protect Neige, the girl he loves. When the latter fled from Neo Arcadia because of the iron-fisted rule of the BigBad, he makes it his mission to bring her back (thinking that she will be safer in Neo Arcadia), all while spearheading Operation Ragnarok, which would obliterate any inhabitable area outside of Neo Arcadia. Neige did eventually talk Craft out of working under the BigBad, only for him to [[spoiler:''destroy Neo Arcadia with the namesake of Operation Ragnarok, a KillSat'', aiming for Dr. Weil. According to the [[AllThereInTheManual Complete Works]], that attack claimed thousands of lives]].
* King Valentine from ''VideoGame/OdinSphere''. His daughter falling in love with [[spoiler: Odin and bearing his children (Velvet and Ingway), to him, meant that she didn't love him anymore and so he killed her with his bare hands. Overlaps with LoveMakesYouEvil as the main reason why he's an OmnicidalManiac -- he can't live with himself even after death knowing he killed her. But it's also strongly implied that enchanting the Valentine kingdom's coins made him a little crazy to begin with]].
* In ''VideoGame/Persona3'', after "The Journey" ends with the heroes defeating Nyx at the cost of [[spoiler:the player character]]'s [[HeroicSacrifice life]], [[spoiler:Yukari]], who was in love with him, is stricken with grief. In "The Answer," when the group gets trapped in the Abyss of Time, and learns that the eight Keys of Time can not only take them back to the present but also give them a one-way trip to anywhere in the past, [[spoiler:Yukari]] elects to return to when before Nyx was defeated and try to find another way that doesn't require the one she loved to die, even if she risks TheEndOfTheWorldAsWeKnowIt. This results in the group fighting each other over what to do with the keys, and when [[spoiler:Yukari]] is defeated, she gives up on her plan.
* In ''VideoGame/PrinceOfPersia2008'', [[spoiler:magical waif Elika [[HeroicSacrifice sacrifices her life]] to reseal BigBad Ahriman back into his can. The Prince, fallen in love with her and devastated by her death, destroys the trees that sealed Ahriman again to bring her back to life]]. The epilogue [[spoiler:establishes that he did this because he knows the prison can't hold, and he'd rather face Ahriman now with Elika's help, then to face him without her down the line. She ''[[WhatTheHellHero clearly really doesn't]]'' agree with his choice though]].
* ''VideoGame/RuleOfRose'': [[spoiler:Gregory loves his son Joshua. Therefore, after Joshua dies of unspecified illness, he becomes a crazed serial killer. Wendy loves Jennifer deeply. Therefore it's completely unacceptable for her that Jennifer could love anything even nearly as much as her, so she kills her beloved dog -- for starters]].
* ''VideoGame/ShadowOfTheColossus'': Wander is so devoted to Mono that he makes a DealWithTheDevil that must be fulfilled via him killing sixteen towering monsters even after being warned of the consequences.
* If Usso fights Laodecia in the final Space Scenario of ''VideoGame/ShinSuperRobotWars'', Fala will show up, vowing to pay back the debt she owes Laodecia. When Usso protests, she tells the little boy to shut up, saying that only a strong man like Laodecia can satisfy her -- and Tashiro wasn't up to the task.
* This trope is the whole shebang of ''VideoGame/SilentHill2'', where the protagonist [[CrusadingWidow James Sunderland]] is absolutely nuts following the death of his wife Mary... to the point where he's desperate enough to believe that [[HesJustHiding she is actually alive and waiting in Silent Hill]]. Of course, his feelings toward Mary, inability to see her suffer, and all-consuming fears of abandonment are so exaggerated that he [[spoiler: kills her instead of letting her die]] and is eventually [[spoiler: DrivenToSuicide]], at least in one ending.
[[/folder]]

[[folder:Visual Novels]]
* [[spoiler:Caster]] in ''VisualNovel/FateStayNight'', who at one of her more sympathetic moments in UBW is extremely stressed over the actions she's been taking. They're horrible things she never would have done in life on top of her not believing her plan will actually work, but she's desperately struggling nonetheless. It would help if it was easier to read what [[spoiler:Kuzuki]] was really thinking. It's not even entirely clear to the reader whether her affections are reciprocated.
* In ''VisualNovel/LuxPain'', [[spoiler:this happens to Yui after Mako dies. She eventually tries to kill Tanaka as revenge for Mako's death]].
* Godot from ''VisualNovel/PhoenixWright'' was rational and was passionate about justice before he [[spoiler:woke up from a poisoning-induced coma to find that Mia Fey, his apprentice who he was in love with, had been murdered. After that, his psyche became a messy ball of anger, self-loathing, and obsession, reshaped for the sole purpose of getting revenge against Phoenix Wright, who he blamed for her death but actually had nothing to do with it; in fact, he's the one who put away the guy who actually ''did'' kill her. Even Mia (as a ghost) directly telling him that he's being ridiculous does nothing to halt his crusade]].
* If you thought the ''VisualNovel/SchoolDays'' anime was bad for this, just try the original visual novel and one of its companion games, ''Cross Days''. Now with multiple bad endings involving various kinds of sharp object. Or trains.
* ''VisualNovel/{{Tsukihime}}'':
** Roa. Arcueid is so beautiful! How can I make her like me? Oh I know, I'll make her turn me into a Dead Apostle so I gain immortality, steal some of her power, turn her against every other being like her and then turn up in random towns for the next eight hundred years so she has to come find me and kill me! Man I'm smart, this is sure to work.
** Arcueid actually has the same trouble telling how she feels towards Shiki. She doesn't know why she gets all emotional around him, upset if he breaks a promise, and spends so much time thinking about him. The idea is raised that maybe Arcueid hates him or something but that's [[OfficialCouple obviously not the case.]]
* ''VisualNovel/UminekoWhenTheyCry'':
** EVERYONE! It's true that while [[spoiler:Yasu A.K.A. Shannon, Beatrice, and Kanon]] may be the craziest since [[spoiler:[[AmbiguousGender s/he]] planned the murders of everyone in the Ushiromiya family, as well as a few servants, and a doctor because Battler came to Rokkenjima at the wrong time]], but EVERYONE has their moment where love drives them bonkers.
** Another contender for the craziest is the Ushiromiya patriarch Kinzo, whose hysterical obsession over [[spoiler:his late mistress]] Beatrice drove him to [[spoiler:''[[ParentalIncest rape their illegitimate daughter]]'' because he'd convinced himself that she was her mother's reincarnation]].
** This is PlayedForLaughs in George's ImageSong, "Ai no Sengen". Yeah, that's right. Played. For. Laughs. If you want [[{{Necromantic}} the]] [[LoveMakesYouEvil more]] [[MadLove tragic]] [[{{Yandere}} versions]], you can certainly find that in many other parts of the series.
[[/folder]]

[[folder:Web Animation]]
* In ''WebAnimation/DrawWithMe'', the boy [[spoiler: tries to get through the unbreakable (instantly repairing) glass and loses his hand for it. Then the girl cuts off her own hand to give to him to use to draw]].
* Neomutant from ''WebAnimation/{{TOME}}'' became a hacker in TOME just so he can protect his obsession, Flamegirl, from her actual Love Interest, Alpha. This help is not needed or wanted by the girl or her love interest. He has also been in pursuit of her for an entire year and is seen as being extremely 'dense', as well as selfish, when in regards to Flamegirl. To the point of attacking her love interest within two seconds of being revealed.
[[/folder]]

[[folder:Webcomics]]
* In ''Webcomic/TheDreamer'', Alan infiltrates Gen. Howe's ship just to rescue Beatrice.
* ''Webcomic/ElGoonishShive'' got Melissa, [[ChildhoodFriendRomance Unlucky Childhood Friend]] of Justin. Who told her he isn't attracted to her because he's gay. So she shared this grief with her rumour-mongering sister and everything quickly rolled downhill from there. She had fits of delusion that she could seduce Justin and [[SetRightWhatOnceWentWrong revert the break]] if she tried harder -- until he couldn't stand hearing her name. Sometimes managed to DopeSlap herself out of this, got another boyfriend, but... still continued to slip into this. [[spoiler:They seem to become able to interact normally only after facing a bigger and more immediate problem together.]]
* ''Webcomic/GirlGenius'', which is [[MadScientist not that surprising]].
** Gil [[http://www.girlgeniusonline.com/comic.php?date=20060301 intentionally]] gives Wooster a free excursion to TheMadnessPlace: "...and there is ''nothing'' I couldn't do, had I cause! And ''now''... ''Now, I have one!''"
** When the castle "really flips out" and puts "her beaux" in danger, Agatha "really flips out" too. Later she spouted a fairly crazy (though...it does work) HowDareYouDieOnMe speech.
** Vole may be big and mad, but he wasn't born yesterday, so during TheBigDamnKiss he didn't even try to intervene with his AxCrazy act:
---> '''Violetta''': And here I kept expecting you to ''attack'' him.\\
'''Vole''': Dun be ''schtupid''. She vould ''rip my fangs out''.
** Gil has a tendency towards this trope, especially if he believes someone he loves is dead or missing. When he first thought Agatha was dead, he spent most of his time in TheMadnessPlace. Losing [[spoiler: Mechanicsburg with everyone he cares about inside]] has apparently driven him [[SanitySlippage over the edge]]. He remains [[TheInsomniac awake for weeks]], once again constantly in TheMadnessPlace, resulting in [[CreepyShadowedUndereyes dark circles]] around his eyes, zombie-like look and irrational, violent behaviour.
* ''Webcomic/GunnerkriggCourt'' has a [[spoiler: sentient cruise ship that holds Court Students hostage and wants to use Zimmy's powers to become a living thing]] to win the heart of Lindsey.
* Velma from ''Webcomic/IWasKidnappedByLesbianPiratesFromOuterSpace'' insists this is a good thing.
* ''Webcomic/JackTheAmericanGhost:'' Jack strikes a deal with [[spoiler: Sebastian]] to bring him back to life so he can be with Misha. Possibly subverted, as Go-Eun notes it’s not love but obsession.
* ''Webcomic/{{Narbonic}}'' inverts this. The main character is already insane. Turns out she's more ''normal'' now than before she met her crush and love interest.
* In ''Webcomic/NoRestForTheWicked'', [[https://web.archive.org/web/20060409211018/http://www.forthewicked.net/archive/02-36.html the Beast proposed two hundred and forty-three times, but wonders whether giving her a magical ring was too forward.]]
* There's a mild version in ''Webcomic/PennyAndAggie'', where Duane [[http://www.pennyandaggie.com/index.php?p=832 reflects]] on how his crush on Penny affected him.
* ''Webcomic/SluggyFreelance'':
** Oasis from cranks this trope up to 11 until she finally winds up in a mental institution. She's not gotten any better since leaving either. Sure, she had a point where she managed to level out -- only to [[FromBadToWorse lose it again]] when [[spoiler: her sensei was killed in front of her eyes]]. At this point, only [[RedemptionEqualsDeath death will save her]].
** A more humourous version of this showed up when Gwyn used a LovePotion...and apparently there are ''problems'' when it comes in contact with alcohol...
[[/folder]]

[[folder:Web Original]]
* ''TabletopGame/NewVindicators'' features quite a few characters who go through this. Ryan Mueller develops a loving obsession with Katie Merrick, things don't go so well for her when she doesn't reciprocate his feelings. Also Rift develops into an AxCrazy {{Yandere}} after her feelings for Michuru Bradshaw reach critical mass.
[[/folder]]

[[folder:Web Videos]]
* [[https://www.youtube.com/watch?v=lwnFE_NpMsE Juliet's Sassy Gay Friend]] has to agree when she claims this trope by name.
* ''WebVideo/ToddInTheShadows'':
** Todd's [[StalkerWithACrush love]] for [[Creator/AllisonPregler Lupa]] reaches this.
--->'''Todd:''' I've had my car stereo rigged to play "Making Love" out of nothing at all. I've received more drunk dialing more than anyone who ever dated Creator/CharlieSheen. And I've had live bunnies airdropped into my house.
** In return, WebVideo/TheNostalgiaChick keeps going further into insanity (and she wasn't exactly all there anyway) for Todd. On Website/{{Facebook}}, she's even willing to have sex with his corpse.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/AdventuresOfTheGalaxyRangers'': Zach Foxx is normally TheStoic, a by-the-book contrast to the more "colorful" crew he's commanding. That is, until the Queen put his comatose wife near death with her "dream machine" stunt. Queue TheCaptain breaking into a high-security facility, holding a technician at gunpoint, and impulsively resigning his commission to embark on a suicide run. Of course, the MindRape aspect of that machine didn't ''help'' matters...
* ''WesternAnimation/BatmanTheAnimatedSeries''. Hoo, boy, [[Characters/DCAUHarleyQuinn Harley Quinn]]. She falls in love with [[Characters/DCAUJoker The Joker]] of all people and is as crazy as he is -- perhaps worse since she's treated as callously as anyone. Her story of meeting The Joker is the {{Trope Namer|s}} for MadLove.
* In ''WesternAnimation/BoJackHorseman'', this plays heavily into the backstory of [=BoJack=]'s mother, Beatrice. When Beatrice was a little girl growing up in the 40s, her older brother [=CrackerJack=] was tragically killed while fighting in World War II. Due to DeliberateValuesDissonance, Beatrice's mother, Honey, was unable to grieve for her son properly, which resulted in her causing a scene at a party and deliberately crashing her car, almost killing her and Beatrice. Though they both survived, Honey ended up begging her husband, Joseph (who was unwilling to deal with "womanly" emotions), to "fix" her. Joseph's solution? Have Honey ''lobotomized'', much to Beatrice's horror. One of the last lucid comments Honey said to her daughter was "Love does things to people. Horrible things. Beatrice, promise me you'll never love anyone as much as I loved [=CrackerJack=]." Unfortunately, Beatrice keeping this promise [[UnwittingInstigatorOfDoom ended up causing a lot of pain for a lot of people...]]
* ''WesternAnimation/CampLazlo'': Patsy lies to Lazlo that she is a professional snake hunter who knows Kung Fu. Lazlo believes her, until they end up running from a (tiny, cute) snake and are cornered. Patsy confesses to having lied, and Lazlo asks why.
-->'''Patsy:''' Because love makes us do crazy things!\\
'''Lazlo:''' What?
* As revealed during the GrandFinale of ''WesternAnimation/{{Centaurworld}}'', this was ultimately what brought about and was the driving motivation behind [[spoiler:the [[BigBad Nowhere King]]]]. In several different ways.
** [[spoiler:The original form of the Nowhere King, an Elktaur, believed the human princess he loved could never love him as he was. So, in a fit of lovelorn foolishness, he used the Rift Portal to split himself into two halves. His Elk half and Human Half.]]
** [[spoiler:The Elk half was forced to watch jealously from afar while his human side, The General, got to be happy with the Princess. When he confronted The General over this, The General attempted to murder him. But being two halves of one whole, The General couldn't kill him without killing himself. So he instead locked the Elk away into a micro sized dungeon cell for ''10 years''.]]
** [[spoiler:Free of the dungeon, the Elk, crazed from a decade of being locked away and denied his love, used the portal to make his Minotaur army. Degrading into the beast known as The Nowhere King.]]
* ''WesternAnimation/CodeLyoko'': Where to begin?
** Jérémie Belpois. To put it bluntly, he willingly puts his entire world on the brink of malevolent A.I. apocalypse just about every day for the sake of maintaining a relationship with Aelita.
** In "The Chips Are Down" when Ulrich finds out that Yumi may have to move to Japan due to financial issues, he memorizes the day's winning lottery numbers, reverses time, fills out a lottery ticket, and hands it to her family.
** Despite what one might think, it's more of an InformedAttribute with William Dunbar. Around Yumi he's more of a StalkerWithACrush -- about the worst he's done ([[SixthRangerTraitor in regards to their relationship]]) is follow her home to try and kiss her. He does, however, love to brag about how love makes him crazy -- "totally insane", in fact -- and he ''was'' expelled from his previous school for putting up poster-sized copies of love letters everywhere (including on his principal's car).
* Trixie from ''WesternAnimation/TheFairlyOddParents'', in the episode where Timmy wishes the two of them were the last people on Earth. This is weird, since [[CompressedVice she was sane relative to everyone else on the show before]]. The reason she's crazy is that she's used to many people being interested in her instead of you know... ''being one of the two last people on Earth.''
* ''WesternAnimation/FostersHomeForImaginaryFriends'': One episode "Berry Scary" featured a newcomer called Berry. Berry is initially sweet and polite, but once she develops a crush on Bloo she turns into psychotic GreenEyedMonster who continually [[FriendVersusLover tries to get rid of Bloo's best friend Mac so that she can have Bloo to herself]]. Bloo, on the other hand, is completely oblivious to Berry's obsession with him (he can never remember her name or, in some cases, her existence), but he gives Berry mediocre and rather dismissive compliments that somehow convince Berry that he loves her as well.
* All over the place in ''WesternAnimation/HeyArnold''. Besides Helga's complete obsession with Arnold, whenever Arnold is around Ruth (and later, Lila), he ends up acting very nuts indeed.
-->'''Arnold:''' [[BrokenRecord Hi Ruth... Hi Ruth... Hi Ruth... Hi Ruth... Hi Ruth...]]\\
'''Gerald:''' There goes one sick kid.
* ''WesternAnimation/{{Kaeloo}}'': In seasons 2-4, Pretty would go to absurd and irrational lengths to be with Mr. Cat and was utterly obsessed with him. In season 5 she says the trope name word-for-word when reflecting on her actions after falling out of love with him.
* ''WesternAnimation/KimPossible'''s interactions with recurrer Josh Mankey (and a few other select young men) cause her to do some irrational things when she really ought to know better. Josh isn't actually a bad guy, but fans tend to [[DieForOurShip vilify him for the influence he holds over Kim]]. Trouble with romantic relationships remains her major AchillesHeel for the entire series, to the point that Dr. Drakken's ultimate plan to stop her from interfering during TheMovie involves a new boyfriend. Sidekick Ron is not much better, doing crazy stuff for almost any reason all the time, but on Kim it's far more noticeable given [[CompressedVice her usual hyper-competence and level-headed nature]]. By contrast, her RelationshipUpgrade with Ron in Season 4 had no negative effects on her behavior.
* ''WesternAnimation/ThePenguinsOfMadagascar'''s Rico is already crazy, but when love comes into the equation...
** "Kaboom and Kabust" includes an explosive FallingInLoveMontage between Rico and his newly-discovered enabler King Julien. His permissiveness whips Rico into an increasingly wild frenzy until it's all the other penguins can do to contain his destructive rampage to ''part'' of the zoo.
** In "Hello, Dollface", his beloved [[CargoShip Ms. Perky doll]] gets a voice chip, and he does ''everything'' she says... to the point of [[spoiler: becoming a hippie]], much to Skipper's horror.
* In the ''WesternAnimation/TeenTitansGo'' episode "The Date", this is very clearly the case with Robin in regards to Starfire. {{Lampshade|Hanging}}d by the voice in Robin's head, who points out exactly what ''kind'' of crazy love is making him.
* The Maximal Silverbolt in ''Franchise/{{Transformers}}: WesternAnimation/BeastWars'', despite being as heroic and noble as they come, did some highly illogical things for the love of the Predacon Blackarachnia, mainly because of the aforementioned heroism and nobility. Of course, in the end he was right about her, but it was foolish at the time, and he was punished for it. In this case, the other Maximals thought love had made him crazy, when in fact he just had some insight.
* The ''WesternAnimation/WhatIf2021'' episode [[Recap/WhatIfS1E4WhatIfDoctorStrangeLostHisHeartInsteadOfHisHands "What If Doctor Strange Lost His Heart Instead Of His Hands?"]] focuses on a desperate Doctor Strange trying to undo the death of his girlfriend Christine. His sheer obsessive drive to revive her turns him into a complete lunatic, a full-on EvilSorcerer convinced that he can undo what is a fixed point in time. [[spoiler:His obsession ultimately results in the destruction of the ''entire universe''.]]
* In the third episode of the second season of ''WesternAnimation/WinxClub'', after Brandon falls off a cliff, Stella (who was unable to transform at the time) actually jumps after him.
[[/folder]]
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