Here is a completely unscientific and nondefinitive list (in no particular order) of some of the greatest suspense/horror films of all time. Not necessarily the goriest or most gonzo, these are films that sank into the viewer's psyche — and stayed there.

Psycho

1960, Alfred Hitchcock

No listing of horror/suspense films would be complete without an entry from Hitchcock. This one has the legendary shower scene, so here it is.