'''Basket Case''' is a 1982 horror film by Frank Henenlotter. It was followed by two sequels, ''Basket Case 2'' in 1990 and ''Basket Case 3: The Progeny'', in 1991.

Young Duane is a nice young man from the country who has arrived to New York, carrying with him a big basket. It actually contains his deformed separated Siamese twin brother, Belial, and they both want to get revenge on doctors who forcibly separated them as children, trying to kill Belial.

Please not do not confuse it with the Music/GreenDay song of the same name.

!!These movies contain the following tropes:
* AlwaysIdenticalTwins: Averted to hell.
* AssholeVictim: The back alley doctors who separated the two, plus one of Duane's neighbors who tries to rob his hotel room, and a guy in a movie theater who tries to steal Belial's basket.
* AxCrazy: Belial.
* BabiesEverAfter: Basis of the third film.
* BigEater: Belial sure can polish off a lot of burger patties.
* BreadEggsMilkSquick: This exchange between Duane and the reporter who threatened Belial along with his fellow freaks.
--> '''Duane Bradley:''' He figured you could ask him a few questions, get to know him a little bit. Then he could rip your face off. No big deal.
* ConjoinedTwins: Duane and Belial, until they were separated.
* DisproportionateRetribution
* FaceHeelTurn: Although [[spoiler:Duane originally just wanted to get revenge on the doctors who forcibly separated him from Belial, he is obviously shocked from the latter raping Sharon and tries to get rid of him. By the sequels, he turns cold-blooded and has no qualms for letting people die for trivial reasons.]]
* FanDisservice: Let us admit it: the overweight and not in her prime Beverly Bonner is not exactly third page material. [[spoiler:Luckily she removes her bra offscreen.]]
* {{Fanservice}}: Sharon gets a extended topless scene in the first film
** Opal puts on a dominatrix outfit in the 3rd film.
* GroundedForever: In ''Basket Case 3: The Progeny'' after the Sheriff catches his daughter Opal putting on a dominatrix outfit and routine for Duane.
-->'''Sheriff''': Cause you are grounded little miss! You are grounded for the next ten years! And no more car, and no more allowance, and you can forget about that pony I promised you!
* {{Homage}}: The second film seems to homage the original ''Film/{{Freaks}}'' film and the horror comic ''Beautiful Freak''.
* [[spoiler:HumongousMecha]]: Belial gets one in the third film, allowing him to battle the Sheriff.
* LongestPregnancyEver: Susan from the second movie is pregnant (and not showing at all) and has been for the last six years.
* MaleFrontalNudity: Duane dreams to be roaming the streets of New York totally naked. It is kind of disturbing, as we see his penis buoncing up and down while he runs.
* MadwomanInTheAttic: Type 1.
* MeaningfulName: Belial is the name of a demon.
* MoralDissonance: Boy, we are definitely not guaranteeing you will be rooting for these guys in the sequels...
* MoveAlongNothingToSeeHere: In the third film, the placard on the traveling freaks' refurbished school bus reads "No One You Know".
* NamesToRunAwayFromReallyFast: When you're called Belial - the name of a ''demon'' -, it is obvious you're not going to be much of a party man.
* RapeAsDrama: [[spoiler:Belial rapes Sharon in the first film]].
* RapeIsASpecialKindOfEvil: [[spoiler:Belial's raping of Sharon makes Duane tell he's had enough of him.]]
* RedEyesTakeWarning: Belial's eyes glow red when he is having evil thoughts.
* ShoutOut: In the music video of Music/TheRollingStones' "Too Much Blood" from their album ''Music/{{Undercover}}'' a young girl is watching this film on TV.
** Also used for a game of ''Newsflash'' in TheRevival of ''WhoseLineIsItAnyway''!
* SlidingScaleOfComedyAndHorror: The first film is dark and gritty. The sequels are sillier and introduce some humor (although dark.)
* SpotlightStealingSquad: Granny and the other freaks in the sequels.
* TheFamilyThatSlaysTogether
* TwinTelepathy: Though somewhat one-sided.
* TwoPartTrilogy: The second two films are more similar in tone and share more cast with each other than they do with the first film.
* VillainProtagonist: [[spoiler:Duane and Belial]] become this by the sequels.