History BrotherSisterIncest / Films

* In TromeoAndJuliet, the titular lovers find out they're really brother and sister, but decide "Fuck it", and continue there relationship anyway. Yeah.

* The internet can't seem to get over the fact that for ''TheDarkKnight'', Harvey Dent's originally planned actor was going to be JakeGyllenhaal. For those of you who don't get this, JakeGyllenhaal's sister, MaggieGyllenhaal, plays Harvey Dent's love interest Rachel. And yes, he was the other gay cowboy with HeathLedger in [BrokebackMountain.

* Used very disturbingly in ''Henry: Portrait of a Serial Killer.'' This trope is something of a BerserkButton for Henry, so when he walks in on his crime partner raping his own sister, he kills them both.

* The creepy incest vibe was [[IncrediblyLamePun written]] all over ''HouseOfWax''. [[{{Twincest}} Nick and Carly]]'s [[SiblingRivalry complex and rivalrous]] relationship is mixed with a strong dose of affection bordering on downright incest, fact revealed from their implying gestures towards one another, particularly [[BigBrotherComplex Nick's ones]]. The movie is filled with it from the beginning, until the end.

* ''TheOtherBoleynGirl'': Anne Boleyn miscarries her second child, then asks her brother George to try to impregnate her.

* In the SoBadItsHorrible ''TheDarkIsRising'' [[TheMovie movie]], there is a distinctly [[IfYouKnowWhatIMean unsisterly]] vibe towards Will from the youngest sister.

* ''TheRockyHorrorPictureShow'': Riff-Raff and Magenta certainly seem to have a closer relationship than most siblings (just look at a certain phrase above...). The same actors, playing different characters in the [[SoBadItsHorrible execrable]] sequel, ''Shock Treatment'', have a much more explicitly BSI relationship.

* A possibly unintentional example, but in Film/{{Transformers}}, according to Sam's [[http://tfwiki.net/w2/images2/c/c7/Witwickytree.jpg family tree]], the Witwicky are apparently inbred. This however might just be the fact that Sam ended up with a CriticalResearchFailure.

* ''This World, Then the Fireworks'' (1997) a film noir with Billy Zane and Gina Gershon as twins.

* The creepy incest vibe was [[IncrediblyLamePun written]] all over ''HouseOfWax''. [[{{Twincest}} Nick and Carly]]'s[[SiblingRivalry complex and rivalrous]] relationship is mixed with a strong dose of affection bordering on downright incest, fact revealed from their implying gestures towards one another, particularly [[BigBrotherComplex Nick's ones]]. The movie is filled with it from the beginning, until the end.

* In the deeply fucked-up ''Dogtooth'' (Greek title: ''Kynodontas''), this is taken to an extreme: [[spoiler:the parents let the son choose which sister he wants to have sex with after the woman Dad had been bringing home for him breaks the psychotic rules of the household and is ousted. She doesn't enjoy it.]] [[ItGotWorse It Gets Worse.]]

* After all the goat screwing, mass murders, and rapes; it turns out the serial killer couple in IslandOfDeath are brother and sister.

* Even though [[ToyStory Jessie and Woody]] have never been shown to have any romantic feelings regarding one another, few shippers are still disappointed Jessie and Woody never had this kind of relationship.
** Er, did it ''ever'' say that they were brother and sister?
*** Well they are both from the same Woody's Roundup Family and both had a more brother-sister relationship than anything else.
** To be fair they do have their fair share of ShipTease due to RelationshipWritingFumble.

* In the 2009 Mexican drama ''Daniel & Ana'', pornographers kidnap two siblings and force them at gunpoint to have sex on camera. Following their release, Ana, now dreading her upcoming marriage, enters therapy, while Daniel becomes consumed with lust for his sister.

* ''This World , Then the Fireworks''(1997) a film noir with Billy Zane and Gina Gershon as twins.

* HouseofYes: the twins blatantly admit to their incestuous behavior much to their younger siblings' disgust.

* ''House of Yes'': the twins blatantly admit to their incestuous behavior much to their younger siblings' disgust.

* In the 2009 Mexican drama ''Daniel & Ana'', pornographers kidnap two siblings and force them at gunpoint to have sex on camera. Following their release, Ana, now dreading her upcoming marriage, enters therapy, while Daniel becomes consumed with lust for his sister.
* One of the few comedies on this list, TheHouseofYes, deals with the incestuous relationship between a brother and sister who are also twins.

* In the 2009 Mexican drama ''Daniel & Ana'', pornographers kidnap two siblings and force them at gunpoint to have sex on camera. Following their release, Ana, now dreading her upcoming marriage, enters therapy, while Daniel becomes consumed with lust for his sister.

* ''Innocent Lies'', a very British thriller, has this between Celia and Jeremy. They flirt rather openly (including eating melted chocolate off each other) despite Celia being engaged. We later hear her tell a detective all the sordid details of her {{Squick}}y sex life with her brother. [[spoiler: The two even resort to murdering their own mother to keep their relationship a semi-secret.]]

* Innocent Lies, a very tepid British "thriller", has this between Celia and Jeremy. They flirt rather openly (including eating melted chocolate off each other) despite Celia being engaged. We later hear her tell a detective all the sordid details of her {{Squick}}y sex life with her brother. [[spoiler: The two even resort to murder to keep their relationship a semi-secret.]]

* ''Say It Isn't So'' Uses this as a joke for almost the whole film-Jo(Heather Graham) and Gilbert(Chris Klein) fallin love, Jo's parents aren't too happy that they're daughter isn't dating a rich guy, so they come up with a plan to convince them that they're borther and sister, so the Jo can marry someone rich, he realizes they're not related when Jo's REAL brother shows up, then HilarityEnsues when Gilbert repeatedly goes to great lengths to convince Jo that they aren't related.

* Richie and Margot's intense desire for one another initiates several important plot elements of {{The Royal Tenenbaums}}. Of course, as Royal would always point out, she's adopted, {{So Yeah}}.

* In the adaption of ''{{Flowers in the Attic}}'', they removed much of this trope when it came to Christopher and Cathy, but not completely - this troper was getting major incestuous vibes, without having had any idea what happened in the books. See, they were obviously very very close, they were awfully comfortable getting nekkid around each other, and at one point he washed her back for her while she was in the bath... SoYeah.

*''Say It Isn't So'' has exactly one joke: Chris Klein dates Heather Graham, is led to believe she's his sister. When he finds out he's not he must win her b....zzzzzzzzzzz....