hmm dunno if films have really freaked me out. i can be really scared right then and there but usually as soon as the movie is over, i'm alright.
with videogames though. i played the The Thing videogame, and it scared me a bit. then i forced my dad to play. he got bored. i played more. got scarred for life. had horrible nightterrors where whenever i closed my eyes the aliens would appear and haunt me. one awful night with this. i had NO sleep that night. i never touched the game again, and the atmosphere still creeps me out. imo much scarier than the movie, but mostly cause when you play, you feel as if it's you in the game.