Scariest movie you ever saw! Mine was

[passion4audio]

(if memory serves - as this was when I was a young kid - and THAT may have been a factor on how scary I perceived it) an old black and white - I can't recall the name, but if someone knows...

One scene:

A man (doctor?) was sitting in a wooden chair in the middle of a room and he had this very large and grotesque "death smile" on his face. Can't remember much else as I had nightmares about this for several years. Maybe he was dying and he had his family around - all "after" the large inheritance? Sorry for the very fuzzy details.

What is your "scariest movie"?