I'm not sure whether David Lynch's Eraserhead could be categorized as horrific but I found it...hmm...interesting...to say the least.
Horror movies amuse me. I can't recall a "horror" movie that has been the least bit scary to watch since I was a kid. Back then, Hellraiser, A Nightmare on Elm Street, Rosemary's Baby, Nosferatu and What Ever Happened to Baby Jane? (a psychological thriller more than a horror move perhaps) were pretty awesome to watch and are the most memorable to this day.