What is the scariest movie you have ever seen?

was wanting to find a movie that can REALLY have me scared, The only two movies that have actually given me chills are Dead Silence and [REC] (The original spanish version of Quarantine). I'm not talking about the usual answers like The Exorcist and Bram Stokers Dracula, I mean a movie that actually (As corny as it sounds) change the way I feel and actually give me that "scared for my life" and "turn on all the lights" kind of feeling, Something like a ghost or even religious horror has the best effect in my opinion..What are some movies like that?