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http://www.imdb.com/title/tt0923600/
I'm not even sure if this is a horror movie but when I saw the trailer I thought it was a sequel to The Strangers at first.
Plot: Four struggling actors retreat to a cabin in Big Bear, California in order to write a screenplay that will make them all stars. Problem is: What happens when their story idea -- a horror flick about a group of friends tormented by a villain with a bag over his head -- starts to come true?
Trailer: http://youtube.com/watch?v=hTGeVWhBj5E