:afr: Psychological Horror:  Session 9,  Sybil,  The Shining,  Jacob's Ladder

Supernatural Horror:  The Exorcist,  Let the Right One In,  The Ring,  Angel Heart,  Carrie (1976 original)
:crazy2: Slasher Horror:  Psycho (original Hitchcock),  Scream (first one),  Texas Chainsaw Massacre (1974 original)
Horror/Sci-Fi:  Alien,  Event Horizon,  The Thing (1982 original),  The Fly (1986 remake)