Basket Case
One of the movies I used to see the cover of years ago in video shops, always thinking it was a pile of crap best forgotten. But those were before the days of Quentin Tarantino, Eli Roth, and the famous fanboys who grew up loving that stuff and now (coupled with the age of DVD) give these schlocky films a new lease of life.
A nerdy guy with a frightening afro (for a white boy), Duane, comes to a seedy Times Square motel with a large basket containing his horrifically deformed twin brother, who looks like a pile of porridge and moves with the stop-motion animation style of an early Ray Harryhausen effect).
Duane is tracking down three doctors and trying to keep his insane killing machine brother under wraps (literally), while trying to live his own life with pretty doctor's receptionist Sharon.
We learn during an extended flashback sequence that they were Siamese twins, the evil twisted one separated from his brother and left for dead by their father and the three unfeeling doctors against both their will, taken care of after that by a kindly Aunt.
Determined to take revenge, Duane has bought his brother to New York to take revenge on the remaining two doctors who now practice there (after dispatching the first one in the pre-credits sequence). Jealousy gets in the way, Duane's relationships (between both brother and Sharon) are inevitably doomed, and it all ends in bloodshed.
It borrows the grimy tapestry of the city from Taxi Driver and other 80's films that characterised New York as a filthy, scary place full of dangerous degenerates, but takes it to the nth degree both figuratively and literally.
If not for the blatant cash-in of the movie being released on DVD for Tarantino fanboys, it could easily have been left forgotten on the shelf of a thousand video shops who didn't know where to keep it and weren't cool enough to have a 'cult' section. It's cheap and only barely entertaining trash.