Movie Description
Maniac is a 1980 American exploitation slasher film directed by William Lustig and written by Joe Spinell and C. A. Rosenberg. The plot focuses on a disturbed and traumatized serial killer who scalps his victims. Spinell also developed the story and stars as the lead character. With a minuscule budget, many scenes in the film were shot guerrilla style. Originally considered an exploitation film, Maniac has since attained cult status. The Hollywood Reporter called it "something of a grubby touchstone among genre fans."
(Summary from Wikipedia)