Night of the Demons

A gang of thoroughly objectionable teenagers party Halloween away in a haunted house. Some of them get possessed by evil spirits, and the frequent foulness of language is then replaced by nastiness of a different sort. A girl dances around a room with a bodiless arm clamped to her ankle (severed while a couple copulate in a coffin); a boy gets his eyes squished out by the bimbo who's putting him up; but the best bit is when a somewhat distraught young lady pushes her lipstick inside her left breast. You feel for her.