Not the scariest movie but Pitch Black. I was 7 and definitely didn't help my fear of darkness very much. Pretty neat movie as an adult but definitely get flashbacks when I see it. Also the movie Signs. Was scared of it as a kid but as an adult I find that movie absolutely hilarious.

But the worst is not a movie but a video game. I watched my brother play Resident Evil 2 when I was around the same age. I was absolutely terrified of zombies after that. Because of a few specific scenes in the game I refused to have my bed close any windows. Even at friends houses I'd rather sleep on the floor if the couch was too close to a window. That lasted until I was like 13. As an adult I still can't bring myself to play that game. I love Resident Evil and horror games in general, but as soon as I hear the music for the main lobby of the police station in Resident Evil 2 I get so terrified I have to turn the game off. Maybe I'll be able to play the remake...