When a man (and it's almost [[AlwaysMale always a man]]) saves a girl on the street from being harrassed by some undesirables by coming over and pretending to be her boyfriend or brother, or something similar. The girl is usually not aware that the guy is about to do this, and often doesn't even know the guy in question. This doesn't stop them from [[BecomingTheMask turning into real lovers]], though.
The idea behind this trope is that a man can only be dissuaded from going after a woman if he knows she's already taken, [[UnfortunateImplications regardless of her level of interest in him]].

Compare TheBeard, FakeOutMakeOut.

----
!!Examples:

[[foldercontrol]]

[[folder:Advertising]]
* In a commercial for Dentyne Ice gum, a man at a laundromat is throwing increasingly moronic pickup lines at a woman who is showing increasing irritation. Finally, another guy walks up, says, "Hi, honey," and kisses her, then gives her a pack of said gum she'd "wanted". The guy trying to pick her up quickly excuses himself...and when he's gone, the guy who kissed her introduces himself, shaking her hand.
[[/folder]]

[[folder:Anime and Manga]]
* ''Manga/ACertainScientificRailgun'', where Touma attempts to do this with [[{{Tsundere}} Mikoto]]. The jig is up before it even begins.
** Chronologically later, in ''LightNovel/ACertainMagicalIndex'', Mikoto uses Touma to fend off the attention of someone she can't afford to offend or electrocute.
* Used in an odd sense in ''Manga/AiYoriAoshi''. Kaoru dissuades a pair of guys from making a move on Aoi with this claim...kicker being he really ''is'' [[ChildhoodMarriagePromise her fiance]], and he'd just kicked her out of his home suspecting her of being a ploy by his estranged family to get him to return (only to immediately realize his mistake). The incident kicks off the two's relationship.
* Inverted in the hentai anime ''Sex Friend''. Mina brushes off a persistent ex-lover by grabbing protagonist Takabe and claiming him as her boyfriend.
* ''FruitsBasket'': Kyo pulls a non-verbal version of this to protect Tohru from some guys that want to take advantage of her.
* In ''VisualNovel/{{Clannad}}'', in a rare reversal of roles, Nagisa pretends to be Tomoya's girlfriend at one point to get Sunohara to stop bugging Tomoya. She thought that Sunohara was gay and in love with Tomoya... just another one of [[TheGadfly Tomoya's pranks]] (in reality, Sunohara just wanted to get Tomoya to play basketball with him for totally unrelated reasons). Note that this only applies to the anime adaptation... in the Visual Novel's equivalent scene, Nagisa ''is'' Tomoya's girlfriend at that point.
* Attempted by one character in BlueDrop, but it just makes the Arume he's bluffing threaten to impregnate the woman in question.
* In ''SeitokaiYakuindomo'', Aria escapes from two persistent pickup-artists at the beach by claiming that Takatoshi was her husband. [[TheNapoleon Suzu]] is less than pleased at being treated as their child.
* In ''Manga/SayILoveYou'', Mei calls Yamato in episode 1 after she's unable to reach her mother when she notices there'a a creepy guy following her. He arrives to escort her home, then gives her a kiss, which is enough to scare the guy away, while unintentionally taking her FirstKiss.
* Inverted in ''LightNovel/OreNoKanojoToOsananajimiGaShurabaSugiru''. Masuzu, the most popular girl at the school, gives a very public LoveConfession to Eita, partly because she finds his lack of interest in love fascinating, and partly to stop having so many boys ask her out everyday. She [[BlackMail forces him]] to continue pretending that they're dating by managing to get a copy of a journal he wrote fantasy stories in, and telling him that if he doesn't pretend to be her boyfriend, or he [[SecretKeeper tells anyone]] about the fake relationship, she would release the contents of the journal on the internet. Since he considers the journal to be an embarrassing OldShame, he's forced to comply with her demands. Naturally, this doesn't sit well with his ChildhoodFriend, [[ClingyJealousGirl Chiwa]], who then keeps close tabs on them.
[[/folder]]

[[folder:Comic Books]]
* Bobby and Cecilia do this to throw off the Sentinels in the ''Comicbook/{{X-Men}}'' comics in the 90s.
[[/folder]]

[[folder:Film - Animated]]
* Done in Disney's ''Disney/{{Aladdin}}'', though in this case Al pretends Jasmine is his {{Cloudcuckoolander}} sister. Points to Jasmine for immediately getting it and playing along.
--> '''Aladdin:''' Come on sis, time to go see the doctor.
--> '''Jasmine:''' *to camel* Oh hello doctor, how are you?
--> '''Aladdin:''' Uh uh, not that one...
* In the film version of ''Anime/HowlsMovingCastle'', Howl gets Sophie away from some soldiers who are trying to pick her up by coming over and pretending to be her boyfriend.
[[/folder]]

[[folder:Film - Live Action]]
* Memorably done by John Cusack in ''Film/SayAnything''.
* ''Film/NickAndNorahsInfinitePlaylist'', in which the girl actually request it: "Be my boyfriend for five minutes."
* ''Film/TankGirl''. While Tank Girl and Jet Girl are in Water and Power's prison, Sergeant Small hits on Jet Girl. Tank Girl happens to be nearby and...
-->'''Tank Girl''': Quit pickin' on my girlfriend! [makes out with Jet Girl]
-->'''Sergeant Small''': God, that is... [disgusted look, leaves]
-->'''Jet Girl''': Thanks. It worked.
-->'''Tank Girl''': [mischievous look] What worked?
-->'''Jet Girl''': [disgusted look, leaves]
* Played with in ''Film/{{Predator 2}}''. Jerry Lambert (Bill Paxton) is at a bar. He goes over to a man talking to a woman.
-->'''Jerry''': Hey, do you mind? It's [[MySisterIsOffLimits my sister]]. [man leaves] Oh, you're not my sister.
* ''Film/MrAndMrsSmith'': it's how they met. They actually managed to avoid the ''military'' this way: they were looking for an American traveling alone.
* ''Black Widow'' (1987). Alexandra Barnes and Catharine Petersen are taking a scuba diving class. An unattractive woman with a cold asks to be Catherine's partner, but Alexandra intervenes and says that she and Catharine had already agreed to be partners, much to Catharine's relief. This example fits the trope because there was considerable subsequent LesYay between Alexandra and Catharine, including two kisses.
* GenderFlipped in ''Film/LegallyBlonde'', where [[HelloAttorney Elle]] pretends [[{{Geek}} a boy at her college]] broke her heart, in order to [[AManIsNotAVirgin make him seem cooler]] and get the GirlPosse to stop haranguing him.
* In ''Film/LittleChildren'' , Brad and Sarah [[YourCheatingHeart (who are married, but not to each other)]] hug and kiss once to freak out the yuppies at the playground. [[UnresolvedSexualTension It works.]]
* ''Film/{{Hitch}}'' pretended to be the boyfriend of a woman at a bar to get rid of a guy she obviously was not interested in.
* In ''Film/UnderTheTuscanSun'', Frances grabs Marcello and pretends to be his girlfriend to escape from the men following her. This is an interesting case in that unlike many other such stories, [[spoiler: this one doesn't work out in the end.]]
* In ''Film/FilmGeek'', Niko simultaneously wards off and puts down Brandon by telling him Scotty, whom Brandon called "a spaz," is her boyfriend, and pulls him in for a kiss for good measure. Brandon is not fooled, but leaves her alone.
* Mentioned in ''Film/{{Turistas}}'': "I'm here with my little sister. I get to pretend to be the boyfriend when creepy guys try to bother her."
* An absolutely brilliant example in ''This Means War'' in which Lauren [[{{FakeoutMakeout}} makes out with FDR]] in which to convince her ex, Steve, that she is perfectly happy without him. FDR builds on her [[{{BlatantLies}} story of her surgeon boyfriend]] by adding that he is a [[{{UptoEleven}} neurosurgeon, head of department at a children's hospital.]] He puts the crowning touch on by calling Steve the wrong name--repeatedly. [[spoiler: The payoff comes when Steve's new fiancée clasps Lauren's hand and tells her she's "so lucky", while Steve looks ''verrry'' uncomfortable.]]
[[/folder]]

[[folder: Literature ]]
* AnitaBlake takes hitman Bernardo with her to a [[NinjaPirateZombieRobot werewolf biker-gang]] bar, because she believes they are unlikely to listen seriously to a woman who shows up at their hangout alone.
* Considering the above example, Granny needing to take Greebo with her to the opera in ''Discworld/{{Maskerade}}'' may count.
* In Creator/JohnGreen's ''PaperTowns'', Q goes out pranking with Margo at the beginning of the book. Someone hits on her and makes a comment about her "little brother," ie, Q. She tells the clerk, "Actually, he's my cousin." * grabs ass* "And my lover."
* Happens all the frickin' time in [[Literature/TheBible Genesis]], chapter 20 being a good example. It never ends well, but they keep doing it.
** True, Abraham convinces Sarah to pose as his sister, but the reason was [[InvertedTrope that he himself didn't want to be harmed because of men's attraction to her.]]
* Hoyt does this for Charlotte in ''I am Charlotte Simmons'', pretending to be her brother to protect from a drunk hockey player. He does this largely because he wants to be romantically involved with her. Since his interest in her is very nearly as predatory....
* In the book, ''Son of the Mob'', this is how the titular mob boss's son meets and eventually starts dating the daughter of an FBI agent.
* Occurs a couple of times in Robert Asprin's ''Literature/MythAdventures'' series as a con gambit: a sexy young woman comes onto a guy, and as they're getting cozy, her companion/s burst in, claiming to be brothers, boyfriends or general protectors, protecting the girl's honour. The first time it's used, Skeeve is the mark, and the intent is to rob him. Later it comes back, with the same woman using a variant on the scheme to make the soldiers look like cads.
[[/folder]]

[[folder: Live Action TV ]]
* ''Series/{{Cheers}}'':
** Inverted in the first season episode "Any Friend of Diane's," where Sam has rejected Diane's college friend Rebecca for being boring. To spare Rebecca's feelings, Diane says Sam turned her down because he and Diane are a couple (much to both Rebecca and Sam's surprise). Of course, once Diane says that, Sam and Diane use the opportunity to back-handedly insult and torture one another in front of Rebecca.
** The last episode had Rebecca pretending to be Sam's girlfriend, while Diane's gay friend pretended to be her boyfriend.
* Ross tried to do this for Rachel on ''Series/{{Friends}}'', but it was unwanted because Rachel was actually interested in the guy.
* Orson does this for Susan in ''Series/DesperateHousewives''.
* On ''Series/BlackBooks'' there's an episode where Manny lies about Fran being his girlfriend to impress his parents.
* ''{{Fringe}}'', Olivia and Peter are at a bar looking to get information from a contact. They make their contact, and Olivia begins pumping him for information. She introduces Peter not as her boyfriend but as her brother. Later, Peter asks about the "brother" comment, to which Olivia replies something like "Trust me, it works better that way."
* Alex pretends to be Elaine's boyfriend "Bill Board" on ''Series/{{Taxi}}''.
* ''Series/RizzoliAndIsles'' has a LesYay laden version in a scene where the titular characters dissuade a mechanic from romantically pursuing one of them by pretending to be a couple.
* In ''Series/GilmoreGirls'', Emily and Richard invite Rory to a "Yale Party," during which she quickly realizes that she is the only young woman amidst dozens of [[UpperClassTwit eligible young men.]] When a particularly sleazy one starts to hit on her, [[ThirdOptionLoveInterest Logan]] walks in.
* Gabrielle gets a man to do this in the ''Series/XenaWarriorPrincess'' pilot.
* Inverted in the 1990's Australian PoliceProcedural mini-series ''Phoenix 2''. A detective is confronted by a suspect he's following, so he pretends to be meeting his wife, a female bystander whom he surreptitiously shows his badge. The suspect goes on to meet his contact. At the end of the episode the detective mentions that she's rung him up to ask him out.
* ''Series/DoctorWho'': In "The Time of the Doctor," Clara asks the Doctor if he'd like to pretend to be her boyfriend for when her parents come over for Christmas dinner. He dutifully arrives, but he makes the worst possible impression upon the family--''[[ItMakesSenseInContext he's stark naked!]]'' Bear in mind that the trope usually comes into full force at Christmastime; where it normally serves as the main plot, ''Doctor Who'' uses it as the setup to a punchline.
[[/folder]]

[[folder:Theater]]
* In ''On A Clear Day You Can See Forever'', Edward sends off some ne'er-do-wells by pretending to be Melinda's brother, and singing "Don't Tamper With My Sister," an entire song about not going about that kind of thing (in public).
[[/folder]]

[[folder:Video Games]]
* In the game ''VideoGame/StarOceanTillTheEndOfTime'', in order to get a pushy woman away from him, [[BrilliantButLazy Fayt]] pretends that his friend [[LikeBrotherAndSister Sophia]] is his girlfriend. At first she's [[InaneBlabbering left very shocked]], but quickly catches on and goes along with it. After this all, she states that she didn't really mind being considered his girlfriend, which bumps up their RelationshipValues.
** Similarly, in VideoGame/StarOceanTheLastHope, if you head back to the base on Aeos, Commander Graft will think Edge and Reimi are a couple. Like the above example, pretending this is true is the more favorable response. Amusingly enough, [[spoiler:it's very heavily implied the two did hook up in the ending.]]
* In the [[RyuGaGotoku Yakuza]] games it's quite common for the player character to do this with hostesses they romance. Tanimura in Yakuza 4 can take a mission where he pretends to be a woman's boyfriend in order to drive away her ex for an extended period.
* In FinalFantasyCrystalChroniclesEchoesOfTime you can find a girl being hit on much to her annoyance. You can step in and pretend to be her boyfriend, or [[LesYay girlfriend]], and the guy will back off.
[[/folder]]

[[folder:Visual Novels]]
* In ''VisualNovel/MyCandyLove'' one of the endings for the episode where Amber tries to slap you is Castiel throwing an arm around your Candy and saying "Are you trying to bother my girlfriend, Amber?" Which is a rare example of this trope being used to defend a female from another female.
[[/folder]]

[[folder:Web Comics]]
* Breadbun attempts this in ''Webcomic/TriggerStar'' to get away from Quiche. At first, [[http://www.triggerstar.com/index.php?strip_id=478 it doesn't work]], but then [[http://www.triggerstar.com/index.php?strip_id=482 it works all too well]]. Despite this, Quiche is not entirely put off.
* Inverted (unsuccessfully) by [[TheCasanova Sven]] attempting to escape an old girlfriend by claiming he's in a relationship with [[{{Tsundere}} Faye]] in ''Webcomic/QuestionableContent''. Unfortunately for him, Faye is fed up with his antics and simply bluntly explains the situation to the other woman.
[[/folder]]

[[folder:Western Animation]]
* In an episode of ''WesternAnimation/{{Futurama}}'' parodying ''Film/{{Titanic}}'', Fry is simultaneously pretending to be Amy's boyfriend so her parents will stop harassing her about [[IWantGrandkids giving them grandchildren]] and pretending to be Leela's boyfriend to keep her from being harassed by [[AbhorrentAdmirer Zap Brannigan]].
* PlayedWith in ''WesternAnimation/TheLegendOfKorra.'' In "A Leaf in the Wind", Korra tries to sneak into the Pro-Bending Arena in order to watch a match, but is caught by the gym supervisor. Bolin, who is a member of the Fire Ferrets team playing that night, witnesses everything and walks up to explain to the supervisor that she is with him. Korra, confirms the story, [[PlayingWithATrope but also says that she is just "with him", not]] "''[[PlayingWithATrope with]]'' [[PlayingWithATrope him"]].
[[/folder]]

[[folder:Real Life]]
* A bunch of years ago there was some talk of a UsefulNotes/NewYorkCity mugger who would approach people (usually women) and say "walk with me." His cover story was that ''he'' was being stalked/robbed, and if his stalker saw he had a companion they would back off. Of course he got his victim into an alley or other secluded location and then robbed them.
* 18th/early 19th century con men in France. The bait was an [[{{Bishonen}} attractive teenage boy]], and as soon as bait and mark were in a compromising position another accomplice would come by to barge in on the two. He would declare himself to be the unlucky younger party's older brother, or father (or simply a policeman) and threaten the mark into paying up to keep him from going to the police about this horrible affront to the young boy's decency.
* This [[http://notalwaysfriendly.com/busted-on-the-bus/33840 Not Always Friendly]] anecdote.
[[/folder]]

----