[lamuerteflaca]

For me it was The Exorcist. Watched it at 7 or 8. Had nightmares every night for a week. Didn't really learn my lesson though.

[psykovsky]

Happened to me with A Nightmare on Elm Street. I was 6. Also didn't learn my lesson, but never again in my life I had a nightmare. Freddie was really scary, all else can said to be a dream if Freddie isn't there. :)