What is the movie that freaked you out, or in some ways it leaves an impact in your mind? Be it due the reasons that you feel yourself in there or because of that movie, you refrain from doing something (say, eating fish)....or something that runs along those lines (you know what I mean). Maybe you want/like to watch them but you just refused to because it gives you that "ouch"/sad feeling that you withdrawn yourself from it. OR, because of that movie, you stop or start a habit.
28 Weeks Later.
Made of Honor.
Resident Evil. (got no problem with the rest of franchise 'cos they even barely stirr my interest)