DRACULA starring Bela Lugosi is my all time horror classic. I remember as a child looking at a night time television show called Fantastic Features. The look in that man's eyes would keep me too afraid to watch and too curious to turn away. Together with that accent ... that was pure classic!!!
SF is my favorite genre and those old films of the 1950s are great. Them, Giant Mantis, The Blob, The Thing with James Arness, Tarantula just to name a few. But if you want to scare the stew out of me; give me the vamp movies!