->''"Because that's what people do. They leap and hope to God they can fly because otherwise they just drop like a rock, wondering the whole way down "Why in the ''hell'' did I jump?" But here I am, Sara, falling...and there's only one person who makes me feel like I can fly, and that's you."''
-->-- '''Alex Hitchens''', ''Film/{{Hitch}}''

[[LoveHurts Being in love is dangerous for a character.]] Occasionally, a 'main' character who more or less pulled his weight at the start of the series starts to feel affection for another, and the writers like the idea. Suddenly, his own personal plot starts to become [[SatelliteCharacter almost]] ''[[SatelliteCharacter exclusively]]'' [[SatelliteCharacter about that]], and we have nothing to balance out the inherent goofiness and clumsiness that occurs dealing with his emotions. This has an extra layer of trouble if the {{Demographic|s}} of the viewers isn't too heavily interested in the romance, or romance in general. On the other hand, other demographics [[TruthInTelevision can relate]].

This can send someone on the edge of CantCatchUp straight into a ditch and relegate him to the side lines of a story, especially if it's fairly clear that the writers haven't used the character for a while because they don't know what to do with him.

If it isn't focus where they're hurt, it'll be their common sense, [[ExactlyWhatItSaysOnTheTin as suggested by the trope title]]. The love interest may be all wrong for him in reality, anything from making him, or trying, into something he's not, or worse, [[IHaveBoobsYouMustObey outright using him]]. When friends of the character try to snap him out of it, they will be [[YoureJustJealous accused of jealousy]] by the lovestruck victim.

Extremely common in {{shonen}}, when she's [[TwoGuysAndAGirl one of the three or so main characters]]. A female character in particular often becomes a FauxActionGirl this way.

For people who hold this as their viewpoint about love, see SillyRabbitRomanceIsForKids. For a specific form, see CannotTalkToWomen.

Granted, Dumb might be better than [[LoveMakesYouCrazy the]] [[LoveMakesYouEvil alternatives]].

Subtrope of TookALevelInDumbass.


[[folder:Anime and Manga]]
* ''Anime/DragonBallZ'': Krillin had the chance to shut down Android 18 and stop Cell from ever reaching his Perfect form. But because he developed feelings for her, he destroyed the only chance to stop it from happening.
* At one point in the ''Anime/YuGiOhGX'' anime, a creature was introduced that literally made other creatures dumbstruck with love. She was (appropriately) called the "Maiden in Love" and any creature (male of course) that attacked her would then fall under the control of the player using the Maiden.
* Miyagi, Sakuragi, Aouta and Haruko in ''Manga/SlamDunk''. The mention and/or sight of their crushes can make them reach varying stages of ditziness, no matter where they are. Of course, according to fangirls, [[DoubleStandard in the boy's cases it's sweet and funny, and in Haruko's case is a horrible sin]].
* Ohgi of ''Franchise/CodeGeass'' was the voice of reason of the Black Knights, until he encountered and fell for Villetta. Needless to say, he became one-track minded soon after and made some incredibly rash decisions, [[UnwittingInstigatorOfDoom not the least of which]] resulted in Lelouch being betrayed by the Black Knights.
* Sakura in ''Franchise/{{Naruto}}'' cemented her reputation among fandom as a [[TheLoad mostly-useless]] character when she missed [[spoiler:two easy attempts to kill Sasuke]] because of her perpetually [[AllLoveIsUnrequited one-sided]] feelings for him, and then afterwards admits that she can't do anything to save or stop him after all.
* Dr. Tofu from ''Manga/RanmaOneHalf'' is arguable, since one of his traits from the start was the inability to function properly around Kasumi. Swiftly becomes a moot point, once he's [[PutOnABus replaced]] as the show's source of arcane knowledge by Cologne.
** Ryoga Hibiki does some pretty dumb things because of love as well. His unrequited desire for Akane's heart is his biggest emotional target, and he tends to go crazy when he thinks there's some sign she truly does love him back. At one point, he even considered staying in the [[{{Kimodameshi}} Cursed Tunnel of Lost Love]] because Akane was frightened by the ghosts and kept clinging to him for protection and comfort -- he figured that if he and Akane stayed there forever, she would always be turning to him for comfort. He gave it up mainly because the others caught him before he could run off with Akane and get lost in the tunnel.
* ''Manga/RosarioToVampire'':
** Tsukune Aono [[spoiler:before his power up]]. He doesn't come off as dumb at first, but common sense and obvious logic are trumped whenever Outer Moka is in trouble. We're talking to the extent he would take on the equivalent of a M1 Abrams Tank with a slingshot. He [[{{Determinator}} never gives up]] despite how bad the last time was.
** Likewise, the various members of Tsukune's UnwantedHarem often end up doing some pretty idiotic and non-logical things in their attempts to win him over. For example, in ''[=Capu2=]'' episode 8, Mizore, Kurumu, and Yukari get in a big fight in the human world over him and end up nearly breaking TheMasquerade when they decide to use their powers; the fight escalates to the point that Tsukune has to unleash Inner Moka to get them to stop; Inner Moka outright calls them "stupid, immature brats" before [[SingleStrokeBattle K.O.'ing all three of them at once]].
* This is pretty much the entire plot of ''Manga/SchoolRumble''. And neither Kenji nor Tenma was particularly bright to start with, leading the series down some truly bizarre roads.
* Esmeraude (Emerald) in ''Anime/SailorMoon R''. She was so in love with Diamond that she hastily accepted Wiseman's tiara to become more powerful than Sailor Moon and thus, winning Diamond's heart. Unfortunately, her plan falls apart when the tiara transforms her into a dragon rather than a Queen. The senshi (with the help of Tuxedo Mask) defeat the dragon and Esmeraude is momentarily restored to her human form - only to fall into a dark abyss. She whispers Diamond's name as she vanishes. To Esmeraude's credit, the rest of her peers including Diamond also made the colossal mistake of trusting Wiseman.
* Brock in ''Anime/{{Pokemon}}'', who is usually the rational BigBrotherMentor to Ash and Misty (or May, Max and Dawn), tended to lose his cool around beautiful women; especially [[InexplicablyIdenticalIndividuals Nurse Joy or Officer Jenny]] (and since both are ''everywhere'', this quickly became a running joke with him proclaiming the latest one was the fairest of them all).
** It's not that they are everywhere, it's that either their mothers had the worst pregnancies ever, or there are large cloning facilities somewhere. ''Very'' early on (we are talking the first few episodes of ''[[LongRunners season 1]]'') one of the Officers Jenny shows Ash a graduation picture of somewhere around 30 women (all of whom look identical to Officer Jenny, all of whom are named Jenny) who are graduating from the Police Academy. If I remember correctly there was also one of these shown for Nurse Joy, but for nursing school.
** Any Pokémon under the effects of Attract can be seen making a fool of themselves in the middle of battle.
* From the strange and supernatural manga, ''Manga/SexPistols'', [[LoadsAndLoadsOfCharacters one part-time protagonist]] Seth decides, after his boyfriend tries to break up with him, to knock-out said boyfriend, kidnap him, take him ''half-way across the world'' into a ''war zone'' in ''Saudi Arabia'', lock him up, and then forget to tell him that the reason ''why'' he's locking him up is that as soon as he entered the country an entire faction of Seth's family have been trying to '''''kill him!''''' [[SarcasmMode Nice one, Seth]]. And no, he wasn't aiming for an IfICantHaveYou ideology either. Probably.
* In the ''Manga/{{Area 88}}'' manga and OVA, Ryoko has very [[WideEyedIdealist idealistic]] and [[{{Manchild}} immature]] ideas about love. To boot, she is determined to free Shin from servitude at Area 88, but never stops to ask why he might be in the Asranian air force in the first place. Finally, in manga issues that did not make it stateside, [[spoiler: Shin repeatedly breaks her heart, and yet she [[WhyWouldAnyoneTakeHimBack reunites with him]] in the end.]]
** In the manga, [[JerkassHasAPoint Kanzaki even calls her out on it.]]

[[folder:Comic Books]]
* ''ComicBook/ScottPilgrim'' plays with this trope. Granted, [[IdiotHero the titular character is already kind of dumb]] but one can also see this trope in Knives Chau.
* Monkey Khan in Archie's ''ComicBook/ArchieComicsSonicTheHedgehog'', he gave up the Power Ring he uses to make sure that Eggman or the Iron Queen can't control him due to his mostly cybernetic body. [[spoiler: He lets himself be controlled by Eggman just so Mecha Sally won't die, despite the fact that Mecha Sally has no remorse or inhibitions and will happily kill him despite the brief relationship Sally and Khan had.]]
* [[BodyguardBabes Chakra]] in ''ComicBook/LesLegendaires'': [[OriginsEpisode Origines]] combines this with LoveMakesYouEvil. She has a BodyguardCrush on her hirer [[RoyalBrat Prince Halan]], but [[AllLoveIsUnrequited he only has eyes for]] [[BadassPrincess Princess Jadina]]. So what does she do? Well, she helps BigBad [[SorcerousOverlord Darkhell]] to kidnap Jadina. Also, she contacts him through his [[ReptilesAreAbhorrent Lizard-looking]] [[TheDragon Dragon]]. And even worst, when he offers her a meeting ''at night, alone, far from the castle'', [[TooDumbToLive she accepts without taking any measure to ensure her security]]. So there isn't much surprise when, after she handed over the information, said Dragon lampshades this trope before having her RewardedAsATraitorDeserves.
* The root of Hayseed Turnip's problems in the short story in ''ComicBook/MyLittlePonyMicroSeries'' Issue #3 , as every time he faces Rarity he ends up doing or saying annoying things that upset her, much for his dismay.
-->'''Hayseed Turnip Truck:''' She was a vision... The most perfect pony I'd ever seen... '''and I blew it.'''
* From ''ComicBook/AstroCity,'' the brilliant Mock Turtle is blinded by love for his childhood sweetheart Lucia, who he constantly imagines as an innocent girl to be sheltered from his roguish life. She, in turn, easily exploits his intellect and engineering talents for her own gain.

[[folder:Fan Works]]
* ''Fanfic/AdviceAndTrust'': Ritsuko is a very smart and resourceful scientist... but she has fallen for Gendo and has deluded into thinking Gendo does or will love her back... even though he ''always'' treats her like crap at best and an useful but disposable and ultimately replaceable pawn at worst, and he has provided her with plenty evidence that the only woman he will ever love is his deceased wife. Still she repeatedly tells herself: "He will love me. He must! He needs me!"
* ''Fanfic/ACrownOfStars'': Shinji and Asuka develop a rather "enthusiastic" relationship in later chapters; probably making up for years of BelligerentSexualTension. However, they get so wrapped up in their passion that they forget a few things - like using birth control, or that Asuka's future self had been ''pregnant'' when they met. The inevitable finally occurs in chapter 67, and both agree that they should have seen this coming.
-->'''Asuka''': (Now what, Sohryu? I’m so fucking smart, now what do I do? I’ve been bragging to myself about beating fear and deciding my own fate for weeks now. I think fate just punched back.)
* ''FanFic/RosarioVampireBrightestDarkness'': In Act II, Tsukune's [[SuperpoweredEvilSide ghoul form]] [[ExploitedTrope exploits this trope]] upon realizing [[spoiler:Kokoa's]] newfound feelings for Tsukune, [[HydePlaysJekyll secretly takes over Tsukune's body]], falsely declares his love for her, and ultimately tricks her into giving him a blood transfusion while using her newfound [[SuperMode overcharge]], successfully giving it enough power to become a full-fledged ghoul and [[SplitPersonalityTakeover hijack Tsukune's body completely]]; just as the ghoul was expecting, [[spoiler: Kokoa]] is too blinded by her feelings for Tsukune to realize she's just an UnwittingPawn until it's too late. By the very first chapter of Act III, when she realizes her mistake, she's so devastated that she nearly [[DrivenToSuicide kills herself]], and after Tsukune gets a [[RestrainingBolt Holy Lock]] to suppress the ghoul, declares herself Tsukune's servant in penance.

[[folder:Film - Animated]]
* Shang in ''Disney/{{Mulan}}'' is a mild form of this trope. He is a competent and professional soldier, not even letting his father's death [[TheStoic distract him from the task at hand.]] But when he tries to thank Mulan after saving him from Shan Yu and when he later visits Mulan's house, he stammers and generally has no idea how to act around Mulan now that he knows she's a girl.
--> '''Shang''': [[CannotTalkToWomen You...you fight good.]]
* The titular character in ''Animation/RoadsideRomeo''. His love interest tells him that if he truly loves her, he'll have to sing on stage with her at a club. When he gets there, his friends desperately tell him not to because he'll make the BigBad furious [[GreenEyedMonster and bring out his jealousy]]. Romeo has to decide to walk away from the dog and find someone else, or risk his life for someone he's only met twice, and has only known for about three minutes. [[TooDumbToLive Guess what happens.]]
* Sherman in ''WesternAnimation/MrPeabodyAndSherman'': Mr. Peabody is quite surprised that Sherman eagerly tried to save Penny from marrying King Tut, especially when she wouldn't even give him the time of day. However, when trapped inside a pyramid, a bashful Sherman wants to give up, and Peabody's questions [[DiggingYourselfDeeper lead him to act very goofy.]]
-->'''Sherman:''' Give me a break! [[SuspiciouslySpecificDenial It's not like I want to hold her hand, or go to the park... or watch her while she's brushing her hair...]] \\
Or anything!

[[folder:Film - Live Action]]
* ''Film/{{Hellboy}}'': Oh, Abe Sapien. FriendOrIdolDecision, HostageForMacGuffin, [[ThePresidentsDaughter The Villain's Sister,]] CosmicKeystone, and here you were making a fool of yourself for love.
* ''Film/CrazyStupidLove'': It's even there in the title.
* ''Film/AKnightsTale:'' William fully understands ''this'' trope, as after making a faux pas to Jocelyn, she tells him that if he loves her, he'll lose. And so, at the beginning of the next tournament, after the flag for William's first joust is dropped, and his opponent spurs on, the four members of the FiveManBand cheering William on...
-->'''Roland:''' "What are you doing?"
-->'''William:''' (sitting on his horse, going nowhere) "...Losing."
-->'''Wat:''' "I don't understand."
-->'''William:''' "...Neither do I." CRASH!
* In ''Film/StargateContinuum'', Baal uses TimeTravel to maneuver himself into dominance of the Goa'uld System Lords and is in position to conquer Earth with ease. He even brilliantly gains the loyalty of the Free Jaffa movement by dealing with them in complete honesty. His only failing was to let his feelings for Qetesh override his common sense, resulting in her betraying and murdering him.
** This overlaps with DeathByGenreSavvy, as he had become so GenreSavvy he could no longer operate under the ChronicBackstabbingDisorder StupidEvil mindset the other Goa'uld operate under.
* Eddie in ''Film/TheColorOfMoney'' has this with his girlfriend, Carmen. He sees her as a PuritySue, blinding himself to her {{Street Smart}}s and {{delinquent}} past. She's even wearing a necklace she stole from his mother, and he thinks it's just a coincidence.

* In ''Literature/ABrothersPrice'', the oldest present sister Corelle has a crush on the neighbour boy and decided to pay him a visit - despite having been left in charge of the farm and her younger siblings. In the dangerous world where the story is set, this is a very dumb thing to do. The backstory also has a princess who is so in love with her pretty husband, that she excuses even his abusing her younger sister when he claims that the teenager "provoked" him.
* Pretty much the plot of the seventh book in the ''Literature/HIVESeries''. Otto thinks that the reason [[spoiler:Laura]] was acting strange around him was because [[spoiler: he confessed his love to her and it didn't go well,]] but it was actually because [[spoiler: she was being blackmailed by a member of the staff and her family was being held hostage.]] His lack of attention led to [[spoiler: the death , injury or capture of 36 Alphas, and his own expulsion from the HIVE.]]
* This is parodied in ''Plague'' in the ''Literature/{{Gone}}'' series.
--> '''Virtue:''' "I'm going to refuse to do puberty. It makes you stupid."
* OlderThanSteam, thanks to Francois Villon's ''The Great Testament'':
--->Foolish love makes beasts of men:
--->It once caused Solomon to worship idols,
--->And Samson to lose his eyes.
--->That man is lucky who has nothing.
* This could be said for Daisy from ''Literature/TheGreatGatsby'', [[AlternateCharacterInterpretation though she could simply be]] [[BrainlessBeauty like that]] [[UpperClassTwit all the time.]]
** Even more so for Gatsby himself.
* He was never a main character, but [[http://starwars.wikia.com/wiki/Gregar_Typho Captain Typho]], Padme's eyepatched guard in the second two prequels, fell in [[AllLoveIsUnrequited unrequited, unnoticed love]] with her, as revealed in the Franchise/StarWarsExpandedUniverse. After her death and funeral, he observed that she had died of being strangled, but there was no evidence of this on her skin, which meant the Force. Remembering that Anakin Skywalker had been scheduled as guarding her, he decided to track him down and hear the explanation, then either kill him or not depending on the answer. Keep in mind that this is after Order 66. He knows it's a long shot, and he knows that if Padme had known he was in love she would have urged him to let go and live his life, but he feels like he has to do this. Later he decides that Skywalker must have been killed, and Padme soon after, by a Sith, and he must find and kill this Sith - [[{{Irony}} Darth Vader]], specifically. The narration lampshades this once.
--> After all, no one in their right mind deliberately sought to make acquaintance of a Sith. But Captain Typho was not in his right mind. He was in love.
** Notably, while love gave him a goal both very difficult and quite suicidal, it didn't make him stupid. He was able to best the bounty hunter and Jedi killer Aurra Sing, stealing one of her lightsabers and clipping her biocomputer, though he did not kill her. He was cautious and planned, and was able to remember enough about the customs of different species that he could get plenty of information out of them. And he was even smart enough to acquire an obscure PowerNullifier for Force-users, knowing full well that a {{muggle}} can't beat a Sith Lord in a straight fight.
* In the ''Literature/BooksOfPellinor'', Hem repeatedly risks both his life and his mission to rescue Zelika because he loves her, even though he has no way of knowing whether she is even alive. As it turns out, [[spoiler:she was killed soon after her capture]].
* In the ''Literature/{{Dragonlance}}'' novels, Laurana's love for Tanis Half-Elven causes her to make the incredibly stupid decision [[spoiler: to trust her ArchEnemy Kitiara.]]
* Invoked in ''Literature/TheBelgariad'' when Ce'Nedra asks Garion what's wrong with his friend Lelldorin. Lelldorin comes from the Arendish culture, known for HonorBeforeReason, and Ce'Nedra comments that he's "so Arendish, he's practically incapacitated." Garion replies that Lelldorin is in love, and being in love makes some people's brains seem to leak out of their heads. [[{{Tsundere}} Ce'Nedra]], who just recently realized ''she's'' in love with Garion, is ''NOT'' pleased.
* Lazarus Long, in ''Literature/TimeEnoughForLove'', has [[TimeTravel traveled back in time]] over two thousand years to visit his original family in 1917. What he doesn't count on is that, in doing so, he [[ParentalIncest falls in love with his mother]]. This causes him to enlist in UsefulNotes/WorldWarI to win her approval, despite having no personal stake in the war, knowing the outcome, ''and'' not knowing the future from his own personal point of view. [[spoiler:He nearly dies as a result.]]
* In the story "The Warlock's Hairy Heart", seen in ''Literature/TheTalesOfBeedleTheBard'', a fairy tale book for [[Literature/HarryPotter wizards and witches]], the warlock believes that Love Makes You Dumb, so he performs dark magic to prevent this from happening to himself. It didn't end well.
* In Creator/GeneStrattonPorter's ''The Song of the Cardinal'', the young cardinal believes this even while envying the already mated birds.
-->''As for the doves that were already brooding on the line fence beneath the maples, the Cardinal was torn between two opinions.\\
He was alone, he was love-sick, and he was holding the finest building location beside the shining river for his mate, and her slowness in coming made their devotion difficult to endure when he coveted a true love; but it seemed to the Cardinal that he never could so forget himself as to emulate the example of that dove lover. The dove had no dignity; he was so effusive he was a nuisance. He kept his dignified Quaker mate stuffed to discomfort; he clung to the side of the nest trying to help brood until he almost crowded her from the eggs. He pestered her with caresses and cooed over his love-song until every chipmunk on the line fence was familiar with his story. The Cardinal's temper was worn to such a fine edge that he darted at the dove one day and pulled a big tuft of feathers from his back. When he had returned to the sumac, he was compelled to admit that his anger lay quite as much in that he had no one to love as because the dove was disgustingly devoted.''
* In ''Literature/BloodPromise'', Viktoria Belikova falls for a casanova and is ready to be impregnated at age 17. When Rose rescues her, she accuses her of leading the casanova on and not understanding love.
* In ''Literature/CityOfLostSouls'', [[spoiler:Jace has been {{Brainwashed}} by Sebastian, who is about to bring his EvilPlan to fruition. Jace manages to escape Sebastian's control temporarily, and wants to flee with the MacGuffin back to the Shadowhunters in order to prevent TheEndOfTheWorldAsWeKnowIt. However, afraid that the Shadowhunters will kill Jace to stop Sebastian, Clary keeps him from getting away, assuring that he ends up back under Sebastian's mind control and ultimately allowing Sebastian to advance his plan to the next stage]].
* Alluded to in ''Literature/HarryPotterAndTheHalfBloodPrince'', where said prince's notes in an old Potions textbook have allowed Harry to become top of the class. When he has to hide the book to protect his secret from Snape, his performance in class predictably drops; Potions master Professor Slughorn, however, sees nothing odd in this, as it starts shortly after Harry begins dating Ginny Weasley.
* In ''Literature/HeartOfSteel'', falling in love with Julia makes Alistair neglect things like sleep and his plans for world conquest in his pursuit of her. Unfortunately, sleep deprivation leaves him mentally weakened, and vulnerable for the moment when Jim finally wrestles free of his controls.

[[folder:Live-Action TV]]
* Kate from ''Series/{{Lost}}'' started out as one of the main characters in the ensemble, a fairly solid example of a TroubledButCute girl. However, as the series entered its second season, she became increasingly obsessed with Jack. Her attempts to rescue/ingratiate herself with/impress or otherwise have contact with him have led to an ever-growing list of problems that are completely her making--she seems to think she's back on a junior high playground (albeit one where she gets to have sex with Sawyer, the JerkWithAHeartOfGold, before going back to see what Jack is up to), not trapped on an island with a group of psychotics and a bunch of EpilepticTrees.
** This is taken to new lows in the season 5 finale, when [[spoiler: a group of Losties ends up in the past thanks to some pesky time-travel, and they have to decide whether or not to detonate a nuclear bomb, whose explosion might change the future and prevent everything they've gone through to happen. Jack finally admits that his main reason to do it is that he lost Kate's love. Juliet's reason is that she noticed Sawyer, her current love interest, ''looking at Kate in a certain way''. Kate and Sawyer go along with the plan.]] Sadly, Miles and Hurley reluctantly agree instead of pumping these [[EmoTeen emo douchebags]] full of hot lead.
* Damon's love for Elena or Katherine in ''Series/TheVampireDiaries'' means he fits this trope as well as LoveRedeems, LoveMakesYouCrazy, and LoveMakesYouEvil, which he has also played with at some point during the show.
** Klaus can fit too, as he has been manipulated by Caroline a couple of times after developing a feelings for her.
** And as of season 5, Katherine, who [[spoiler: decided to stay in town instead of running away with Nadia after stealing Elena's body]], all because she wanted to woo Stefan.
* Ianto's love for his girlfriend in ''Series/{{Torchwood}}'' leads him to hide her in the basement of a heavily armored and base filled with alien tech. She's a half-converted evil cyborg woman. He then proceeds to date the guy who kills her.
** And Tosh secretly bringing her secret alien girlfriend to work, despite her suspicious resemblance to a serial killer on the loose. And the questionable security movements made by Gwen and Jack for Rhys and John respectively.
* In ''Series/{{Smallville}}'', this is a continually growing problem with Clark to the point that, in the first half of Season 8, he was finally starting to act a little bit like Superman until Lana returned at which point he lost about 7 years of character development. In fact, Lana is acting more active than Clark is, but that's a [[IDidWhatIHadToDo whole]] [[WellIntentionedExtremist other]] [[KnightTemplar set]] [[CanonSue of]] [[GodModeSue issues...]]
** A smaller example: Chloe Sullivan, usually highly GenreSavvy, gets dumb when she is romantically involved with [[spoiler:Ian, Jimmy and Davis]]. Also makes her into a HorribleJudgeOfCharacter for the first and third occasions.
* ''Series/PushingDaisies'' has this as a main element, in a subtle way... until "Water and Power", when the anvil is dropped on Emerson Cod's foot. The Narrator even points this out.
* Nobody, least of all the writer responsible, has any idea why Marian, in the 2006 BBC version of ''Series/RobinHood'' ran up to Guy of Gisbourne, an unhinged man who was obsessed with her, and began yelling: "I love Robin Hood! I'm going to marry Robin Hood!" Guy responded by [[spoiler:running her through with a whopping great sword]].
* Wilson references this in season 4 of ''Series/{{House}}'' after House thinks that his attraction to a female doctor is interfering with his diagnostic skills.
--> "Boy meets girl, boy gets stupid, boy and girl live stupidly ever after."
** There also was an indirect, but very literal version in the episode where the patient of the week was a former prodigy and teen genius, now working as a [=FedEx=] deliveryman. Turns out that he'd fallen in love with a girl who had maybe 1/3 of his IQ, and started habitually using a drug made from a combination of prescription-strength cough-syrup and strong alcohol (known as 'Astro-Tripping' or 'Blue Drank') to slow his mind down to the point where he could relate to her. Of course, using something like that on a daily basis for years can take its toll...
* Suzy Pepper of ''Series/{{Glee}}'' had a crush on her teacher, called him at 3 a.m., gave him a tie with red peppers so when he wears it he can think of her. Teacher rejected her, she ate world's HOTTEST PEPPER, burned holes in her esophagus, and got put in a medically induced coma for 3 days. To add insult to injury, the teacher then added that girls are so fragile.
* Lister references this in ''Series/RedDwarf'':
-->It's really debilitating, being nuts about someone. You lose twenty I.Q. points every time you talk to them.
* Played with in ''Series/{{Frasier}}'', where Frasier is constantly doing face-palmingly stupid things whenever he gets into a relationship with a woman and directly ignoring his very own psychiatric advice...and ''he knows it'', and can't help it, and constantly hopes his romantic plans won't blow up in his face this time, no matter how many times his GenreSavvy little brother reminds him how badly he suffers from this trope, with his stupidity probably reaching a zenith in "Don Juan in Hell". This is just one aspect of pretty much the very core of Frasier's character — being brilliant at giving other people advice, and terrible at following it himself.
* On ''Series/GilmoreGirls,'' Lane is so smitten with a boy that she pets his hair when he's turned around, then runs away, embarrassed. She winds up turning to Lorelai for advice, who advises her that when it comes to love, "it pretty much all comes out in stupid."
* ''Series/{{Sherlock}}'' states this outright in ''A Scandal In Belgravia''. It is directed at [[spoiler: Irene Adler]] who has just finished [[BullyingADragon tearing into him about his apparent asexuality]], something repeated throughout the episode.
--> I've always assumed that love is a dangerous disadvantage. [[TakeThat Thank you for the final proof.]]
* In ''Series/GameOfThrones'', [[spoiler: King Robb Stark]] falls in love with Talisa Maegyr and marries her, despite having already promised to marry Lord Walder Frey's daughter, which doesn't only make him lose an important ally, [[spoiler:but also [[DisproportionateRetribution gets him, his wife, his mother and most of the Northern army killed]] when the Freys murder them [[NastyParty during the reconciliation wedding]]]].
* Dawson from ''Series/DawsonsCreek'' was an example of this from time to time, but averted it a lot early on. While watching a ''film noir'' with Pacey, Dawson couldn't figure out why the detective was so oblivious to the fact that the girl setting him up.
* ''Series/{{Friends}}'': Monica and Chandler when they first develop feelings for each other.
* ''Series/StarTrekDeepSpaceNine'': Odo becomes smitten with [[TheVamp the]] [[EvilMentor Female]] [[BiggerBad Changeling]] during the occupation of Deep Space Nine in "Behind the Lines" and "Favor the Bold." He becomes so absorbed in [[GRatedSex linking]] [[DoesThisRemindYouOfAnything with her]] that he neglects his duties. He became involved with her ''despite'' full knowledge of the Dominion's tyranny and the Female Changeling's [[TheTrickster prior antics]]. Fortunately, he snaps out of it upon realizing what the Female Changeling and the Dominion have in mind for the Alpha Quadrant.
* ''Series/{{Scandal}}'': [[spoiler: Poor Huck. He wanted to believe that his girlfriend Becky was the best thing in the world. But he discovers that she not only shot the President, but set him to be the fall guy. She actually wanted him to come with her, and he was torn over what to do. The good news is that he did the right thing, which was to try to take her down. The bad news is that she caught wind of his attempt, and not only got away, but even murdered the entire family that he keeps an eye on]]!
* Series/WhiteCollar: [[ConMan Neal]] [[MagnificentBastard Caffrey]] is generally [[BadassBookworm pretty intelligent]]. He can always come up with a good plan, and can often get exactly what he wants out of a situation. But his love for Kate has resulted in him making some remarkably idiotic decisions - walking right into a trap that ended with him going to jail and breaking ''out'' of jail only a few months away from the end of his sentence stand out as some of the most egregious examples.
* From ''Series/TheCosbyShow'', the vast major of incidents involving Vanessa Huxtable getting in trouble usually start as a result of her boy-craziness.
* Mentioned in ''Series/{{Castle}}'', shortly after Alexis and Pi break up:
-->'''Alexis''': All those things my dad said when I was moving out, about me making a mistake moving in with my boyfriend, he was right. I can see it so clearly now. Why didn't I then?\\
'''Beckett''': You were in the love haze.\\
'''Alexis''': The love haze?\\
'''Beckett''': It's like a drug. It makes intelligent people do... stupid things. And then it clears and you look around and you wonder "What was I thinking?"
* While ''Series/BuffyTheVampireSlayer'' mostly averts this, the Buffy/Angel romance was definitely this at times, particularly from Buffy's standpoint. While it's slightly justified by her being young, she still crossed this line. How about choosing to get back together with Angel despite knowing it's a bad idea (he'll lose his soul and turn evil if she sleeps with him) and him saying ''to her face'' that he '''''wants her so badly he's willing to lose his soul again just so he can sleep with her'''''. When you ex tells you that, you don't get back together with them.

[[folder: Music]]
* From Music/BlackFlag's AntiLoveSong [[TheCoverChangesTheMeaning rewrite]] of the Kingsmen's "Louie Louie":
-->"This pain in my heart\\
It just means I'm not very smart\\
Who needs love when you've got a gun?\\
Who needs love to have any fun?"
* "Everybody Plays The Fool" by TheMainIngredient is all about this trope.
* "[[https://www.youtube.com/watch?v=-pr-xzajQo0 Herp de Derp]]" by Music/GregoryBrothers is this combined with GibberishOfLove:
-->Herp herp herp herp herp de derp\\
I'm not this awkward all the time\\
Only when love is on the line\\
Herp de derp de derp de derp de derp derp derpy

* One common interpretation of Shakespeare's ''Theatre/RomeoAndJuliet'' has this trope as its lifeblood.
** And in a similar vein, ''AntonyAndCleopatra''.
* In ''Theatre/LittleShopOfHorrors'', all Seymour wanted to do more than anything in the whole wide world was to win Audrey's heart, and blindly listens to [[ManEatingPlant Audrey II]]'s demands of feeding it lots of blood.

[[folder:Video Games]]
* ''VideoGame/BaldursGate'' features Viconia, a NeutralEvil Drow Cleric on the run from her [[AlwaysChaoticEvil equally evil race]]. Then the Player Character saves her a few times, [[LoveRedeems worms his way into her dark heart]], and if he plays his cards right, he can change her alignment to TrueNeutral... which disqualifies her from using a powerful, [[LostForever one-of-a-kind]] holy symbol dedicated to her (still evil) goddess.
** The whole plot of the sequel is essentially caused by the elven queen Ellisime sparing a villain's life out of love, exiling him instead (and doing nothing about his High Mage powers). At the end of the game she publicly admits her mistake, though.
* The title character of ''VideoGame/MaxPayne'' in the second installment probably qualifies. He repeatedly notes that his feelings for Mona are driving him into one mess after another.
* In ''Franchise/{{Pokemon}},'' this is what happens if a Pokemon is hit with the move Attract from a Pokemon of the opposite gender, or if the attacking Pokemon uses a move that require physical contact (e.g. Tackle) onto a Pokemon of the opposite gender with the Cute Charm ability (though it works only 30% of the time in this case).
* Luisa Fortuna of ''VideoGame/RedDeadRedemption'' is shown to be deeply in love with RebelLeader Abraham Reyes, a man who can barely remember her name and is clearly a power-hungry egomaniac. She even goes so far as to [[TooDumbToLive try and attack armed soldiers with a knife in an attempt to rescue him]].
* In TheresiaDearEmile, HotScientist Maylee says this word-for-word after she has sex with the main character of the Dear Martel story.
* In ''{{VideoGame/Persona3}} FES'', near the climax of The Answer, Yukari's character is completely derailed in a way that makes no sense due to her love for the protagonist. [[spoiler: She selfishly wants to use the chance to she has to go back to the moment the MC sacrificed himself and stop him from doing it, regardless that this will ''definitely'' cause Nyx to return and destroy the world. This creates a ConflictBall that results in SEES fighting one another and nearly ending their friendships.]]
* Selvaria in ''VideoGame/ValkyriaChronicles''. She's utterly devoted to Maximillian, but she doesn't realize he doesn't return her feelings until [[spoiler: he sends her to use a SuicideAttack, showing once and for all that he doesn't give half a damn about her personally]]. You'd think that'd be a bad move on Max's part, considering that Selvaria could turn him into a McNugget combo with less effort than it takes for her to get dressed in the morning, plus she's developed a tenuous rapport with her counterpart on the good guys' side and could probably defect to their side. [[spoiler: But no. She goes ahead and blows herself up, tearfully praising Max's name, but makes a point of betraying him at the last second by sparing the only people in the Gallian military capable of stopping him.]]
* In ''VideoGame/DarkSoulsII'' [[spoiler: King Vendrick's]] love for [[spoiler: [[BigBad Queen Nashandra]]]] causes him to make one foolish decision after another, from [[spoiler: waging war against the Giants to numerous failed attempts at curing the Undead Curse, distracting him enough for Nashandra to take the throne from under his nose.]] This trope pretty much sets the entire plot in motion. Even worse, after he figures everything out, he's STILL in love with her!

[[folder: Visual Novels]]
* ''VisualNovel/NineHoursNinePersonsNineDoors'': Junpei and Akane are reasonably intelligent people, except when they're around each other. [[spoiler:Maybe that's why Akane abandoned him when [[VisualNovel/VirtuesLastReward she went off to save the world from Radical-6]]]]. This trope is a major plot point in Akane's backstory, [[spoiler:where it nearly gets her killed and then saves her life]].

%%* Four simple words: [[Webcomic/{{Digger}} "Skin-Painter]] [[{{Tearjerker}} is fool."]]
* [[LampshadeHanging Lampshaded]] in ''Webcomic/GirlGenius'', as Gil is fighting [[SuperSoldier Captain Vole]]:
--> '''Tarvek''': Is this going to be some kind of [[MachoMasochism macho]] exercise where you insist on battling a superior opponent [[IWorkAlone alone]] in some misguided attempt to "prove" your intrinsic worth?
-->'''Gil''': No, no! I'm only '''that''' stupid in front of [[HotScientist Agatha]]!
-->'''Tarvek''': [[LoveTriangle Drat]].
** And earlier, we get [[http://www.girlgeniusonline.com/comic.php?date=20110427 this exchange]].
--> '''Agatha''': But since [Gil]'s the only one who ''has'' [[ObfuscatingStupidity been playing the fool around me]], I can't be sure.\\
--> ''*{{Beat}} panel with Gil [[LuminescentBlush red as a beet]]*''
--> '''Tarvek''': Hee. You weren't ''playing'' the idiot with ''her'', were you?\\
--> '''Gil''': ''Shut up!''
** Tarvek himself acquires [[http://www.girlgeniusonline.com/comic.php?date=20120516 fumbled speech]] on the subject and generally [[http://www.girlgeniusonline.com/comic.php?date=20110907 doesn't]] fare much better:
-->'''Violetta''': You are ''joking!'' I ''really'' have to ''explain'' this to you? You ''[[MagnificentBastard live]]'' for this stuff! ''Argh!'' It ''must'' be love.
** Also implied to have happened to Bill Heterodyne in regards to Lucrezia.
** Then there was Moloch von Zinzer, whose cooking would invariably go from from "acceptable" to "boiled sponge with gravy" immediately after serving Sanaa.
* In her very first appearance, [[StrawFeminist Susan]] in ''Webcomic/ElGoonishShive'' [[http://www.egscomics.com/?date=2002-05-29 declared this trope]]. That said, the comic has not supported her view.
* Webcomic/SandraAndWoo [[http://www.sandraandwoo.com/2011/12/19/0335-the-poem-iii/ nails it]].
* Matt from Webcomic/HodgesPond still loves Trixie despite the fact she put him in a 3 week coma.
* This hit Marion of ''Webcomic/{{Sunstone}}'' hard; being new to the type of relationship she was sharing with Alan caused her to discard her better judgement in favor of doing everything she could to take things further, leading to her neglecting the safety aspects integral to BDSM. [[BodyHorror This does not end well.]]
** Ally&Lisa aren't exempt from this either. It's the main reason they rush into moving with each other [[http://www.urbandictionary.com/define.php?term=Uhaul%20Lesbian just three weeks after meeting in person]].

[[folder:Western Animation]]
* Snap from ''WesternAnimation/ChalkZone'' goes stupid every time Queen Rabsheeba shows up. Usually stuff like eating his magazine, turning into dust, etc.
* ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'' makes fun of this trope. In the movie "Big Boogey Adventure", Grim and Billy have this conversation referring to Irwin's big fight scene.
-->'''Billy''': Hang on; how did [[TookALevelInBadass Irwin get so cool?]]
-->'''Grim''': He's driven by ThePowerOfLove.
-->'''Billy''': Really?
-->'''Grim''': Love makes people do all sorts of stupid things.
-->'''Billy''': I love ''everything.''
-->'''Grim''': [[DeadpanSnarker That explains a lot.]]
* Referenced in ''WesternAnimation/{{Futurama}}'', although the circumstances and Fry's general level of intelligence stop it being an example.
--> '''[[ItMakesSenseInContext The Worm King]]''': He's bluffing! No creature would willingly make an idiot out of itself!
--> '''Fry''': Obviously you've never been in love!
* Non-romantic example: In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode ''[[Recap/MyLittlePonyFriendshipIsMagicS4E26TwilightsKingdomPart2 Twilights Kingdom Part 2]]'', after experiencing Fluttershy's friendship, Discord is so eager to have Tirek for a friend that he becomes GenreBlind to the possibility that Tirek would double-cross him.
* ''WesternAnimation/SouthPark'': In "The Succubus", the typically GenreSavvy Chef falls for a succubus, who has this effect on him, albeit via MoreThanMindControl on her part. It takes the boys exposing her to get him back to reality.

[[folder:Real Life]]
* TruthInTelevision, maybe? [[http://www.telegraph.co.uk/health/healthnews/6132718/Men-lose-their-minds-speaking-to-pretty-women.html This article]] claims it is.
* Everyone in this Website/{{Cracked}} article: [[http://www.cracked.com/article_18922_the-6-biggest-over-achievements-in-history-marriage.html "The 6 Biggest Over-Achievements in the History of Marriage"]]. From entry #6:
-->Why was [the Earl of Snowdon] so full of himself that he took marrying a princess for granted? Some say ego, some blame Margaret, but his prep school classmates probably have the real answer here: He had a monster dong. And that lets you get away with anything.
* While it might be a better example of Lust Makes You Dumb instead of love, people who live in more rural areas will tell you that you're most likely to hit a wild animal crossing the road during the spring. Since spring is mating season when most female mammals go into heat, it would start to appear that the idea of mating starts to override an animal's basic common sense and self-preservation.
* [[Series/CrocodileHunter Steve Irwin]]'s account of the first time he saw his future wife Terri was that he was [[LoveAtFirstSight so lovestruck]] that he nearly got eaten by the crocodile he was feeding at the time.