In Brian De Palma's Blow Out — a high-octane thriller released in 1981 — the opening scene gives the audience the point of view of a killer as he makes his way through a college dorm house. He spies on gorgeous gals as they gossip, dance, and fornicate, even catching one masturbate with the door open. In the end, the scene closes with the killer securing a hopeless and nude target, and one who screams rather awfully. The film isn't a Slasher, but it depicts the genre quite exquisitely.
Anyway... Slashers are pretty fucking awesome. Thought I'd compile a ranking. Will add and review more to the list.