OK, time for me to come clean...the scariest movie for me as a kid was "The Blob", back in the late 50's. The scene where the Blob was oozing out the projection booth windows really freaked me out, especially since I saw it in a movie theater! And I had nightmares for months afterwards, every time the wind would blow a branch against my window.
(shudder)
To this day, I won't watch that movie again. I only wish MST3K could have given it "the treatment".