Help Name That Film

I saw a trailer a long time ago now, it was about 4 or 5 guys who wake up in a warehouse and none of them remeber anything, but one is like a snich or something and they have like an hour to figure everything out and one dies or something..



ring any bells?? its REALLY annoying me.

Its called unknown
http://imdb.com/title/tt0450340/

Pretty appropriate title, really.