Woah, that's a totally loaded question. I like gory movies, and movies where there are monsters and stuff, BUT - the movies that scare me the most are those which you cannot see your enemy, movies dealing with demonic possession, ghosts and the like. The Exorcist, The Entity, and movies like that scared the shit outta me growing up, because although you knew there was an enemy - you couldn't see them, you couldn't shoot them, you couldn't stab them, you couldn't tear them to pieces by blowing them up, there was nothing you could do. They could have their way with you and those around you and there was nothing anyone could do to stop it. THAT'S the type of movie I like.