Raiders face-melting was scary at 7 or 8, Jaws was fucking scary at about 8 or 9, I hid behind the couch for most of it and had shark nightmares. Several horror movie previews I can't remember on our home videos scared me...

Just seeing the covers in the horror section of the video library scared the crap out of me til I was almost Zig's age. The only actual horror movie that scared me for days was Amityville Horror 3, which was the first one I ever saw at about 13.

Nothing was quite as scary after that first one, but others that left a lasting impression were The Omen trilogy and The Exorcist. The end of The Ring freaked me out and I'd be lying if I said Blair Witch didn't make a bit of an impression as well. I'm sure there are a few others that escape me.