I was a really easy to scare child.
I remember being like 6 or 7 and being really afraid to swim to the far end of the pool alone while taking swimming lessons, because this Yu-Gi-Oh card would always pop into my head.
Also, does anyone else remembers this final boss from a shmup called Strikers 1945 2? I recently discovered it was not some weird nightmare I had as a kid.
Grey aliens. That's it. Anytime I'd see them in a movie, TV show, or on a book cover they'd freak me the fuck out so badly I'd have trouble sleeping for weeks. Then I heard on a show (Maybe Unsolved Mysteries?) you'd be especially terrified of the imagery if you'd been abducted before. GAH!
SAME