The Strangers

If you're looking for a fright, The Strangers might be the movie for you. This one had me chewing my fingernails throughout the whole movie. Here's the description from the official site:

Explore your worst fears imaginable with this shocking suspense thriller inspired by disturbing true events. After a 4 a.m. knock at the door and a haunting voice, Kristen McKay (Liv Tyler) and James Hoyt's (Scott Speedman) remote getaway becomes a psychological night of terror as three masked strangers invade. Now they must go far beyond what they thought themselves capable of if they hope to survive.