1
Although it doesn't belong to the genre, Pier Paolo Pasolini's The 120 Days of Sodom is perhaps the most horrifying film that I've ever seen, and I've seen many.
It's also one of those films that, as messed up as it is, would benefit from being remade under the more "liberal" cinema rating system of today (i.e. able to include graphic and extreme content without the threat of mass censorship). The original depicts a lot of different, highly-graphic content, but it's quite cheesy overall, with the acting being somewhat camp throughout. If someone decided to retool the film to adhere to the aforementioned modern standards, there's not a single doubt in my mind that it would be considered the scariest film of all time.
It's a horrifying venture into the corruption of wealth, innocence, and life; I enjoyed the film, although I haven't seen it more than once, and certainly don't plan on seeing it again anytime soon. It's intense.
I almost forgot to mention Gaspar Noé's "Irréversible", starring Monica Bellucci and her then-husband Vincent Cassel. Again, it's not a horror film in the classical sense; it is, however, considered to be an extreme exploitation film with an emphasis on the psychological impact of severe trauma. Very haunting performances from all of the leads. No other film has ever stayed with me in the sense that "Irréversible" has. View at your own risk!
Bookmarks