Halloween
Halloween is as pure and undiluted as its title. In the small town of Haddonfield, Illinois, a teenage baby sitter tries to survive a Halloween night of relentless terror, during which a knife-wielding maniac goes after the town's hormonally charged youths. Director John Carpenter takes this simple situation and orchestrates a superbly mounted symphony of horrors. It's a movie much scarier for its dark spaces and ominous camera movements than for its explicit bloodletting (which is actually minimal).
