Hellraiser. The original Clive Barker horror-fest. This film is so famous because of it's well paced story, believeable yet totally fantastic characters, realistic setting, and of course, those menacing, demoniac creatures from Hell, the Cenobites. Doug Bradley really makes this films Cenobite moments effectively terrifying, his voice like some bottomless pit from which growls some elder horror of vast and terrible knowledge, whose experiences in the realms of pleasure and pain make for some totally hideous scenes.
The Cenobites themselves are bizarre and disturbing, ranging from mawed demons to obese horrors and pinheaded nightmares.
The first in the series, and the best. A seperate entity of terror from the rest.