History Main / LoveMakesYouCrazy

* ''BasicInstinct'' though you can argue its more 'Lust Makes You Stupid''
* In ''ThrowMommaFromTheTrain'', this line is used, word for word, as the last line of ''BillyCrystal'''s book. "Hate makes you impotent, ''LoveMakesYouCrazy'', somewhere in the middle you can survive."

* ''TheHauntingHourTheSeries'': 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). [[WhatAnIdiot Maggie doesn't care]], and ends up dealing with her crush who has turned clingy and deranged.

* This trope is the whole shebang of ''VideoGame/SilentHill2'', where the protagonist James Sunderland is absolutely nuts following the death of his wife Mary... to the point where he's desperate enough to believe that [[He'sJustHiding 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.

* ''MiraiNikki'': Yuno is [[{{Yandere}} singlemindedly devoted]] to Yukiteru.
** Although it's hinted that she was already insane long before she fell in love with him.

* Poor [[Anime/CodeGeass 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 it caused, only then getting her MyGodWhatHaveIDone moment.]]
** [[spoiler: Casualties vary according to translations, with the numbers going up to 35 million. That's a lot of death due to one insane crush.]]

* ''Anime/PuellaMagiMadokaMagica'' has Sayaka Miki, whose love for a childhood friend is unfulfilled, driving her berserk, [[spoiler: and eventually turning her into a huge mermaid monster.]]

** In the manga, Ciel throws himself in front of a bear without a second thought to protect Elizabeth. This act also shows Elizabeth's mother, Frances Middleford, that Ciel is more worthy of being her daughter's future husband than she had originally given him credit for. Still, that could be considered more heroic than crazy, since Ciel knows that if he is in danger of getting hurt, Sebastian can easily save him.
** Keep in mind Elizabeth seems to want Ciel to be like this, since it proves he has feelings for her (He's normally pretty withheld with his feelings). When she's really in danger, she's fully able to protect herself as a prodigy in fencing, but doesn't like to as it makes her seem uncute.

** As one could imagine, being GenreSavvy enough to observe WhatAnIdiot you're being about the whole thing only makes it more frustrating.
** Made even worse when the person is indifferent to friendly towards you, but is clearly not focused on you as a romantic option. Now you have to fight the urge to gamble away hours of your time for a low return on their attention, compounded with your initial attraction. You just cannot win.

* And don't even get us ''started'' on [[Wrestling/AJLee AJ]]

[[/folder]]

* Bellatrix Lestrange from ''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.

* If you thought the ''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.

* Evelyn Draper in ''PlayMistyForMe''.

* Lisa Sheridan in ''{{Obsessed}}''.

* The central theme of the film ''Wicker Park''.
* ''TheEnglishPatient''. The title character, his lover, and her husband were already all a little crazy, but love seems to really bring it out.

* ''RagingBull''. Jake over Vicky. Admittedly he was already pretty crazy but meeting her made him worse

** [[ClingyJealousGirl And]] [[StalkerWithACrush then]] [[LoveMakesYouEvil there's]] [[NightmareFuel Yubel]].

*** 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 [[NightmareFuel you don't even know about it.]]

** It turns out that [[spoiler:Maeve]] was lying and has been under the influence of Nemesis and that she and Aurora were infected with some as of yet unknown disease that makes those who are affected start to work for the Outsiders]]

** It turns out that [[spoiler:Maeve]] was lying and has been under the influence of Nemesis and that she and Aurora were infected with some as of yet unknown disease that makes those who are affected start to work for the Outsiders]]

** It turns out that [[PotHole Maeve was lying and has been under the influence of Nemesis and that she and Aurora were infected with some as of yet unknown disease that makes those who are affected start to work for the Outsiders]]

* Martin Burney in ''SleepingWithTheEnemy''.