Name of 4 - 6 months old of comedy movie

4 or 6 months ago I saw the trailer of a new comedy movie in a Forrest, where there were 2 groups of people kind of:
-Hunters
-Campers
They watch each other in the Forrest and think that the other group are serial killers vice-versa and the funniest things happen, they kill themselves because of that. An ex in the trailer a guy runs and spear himself by a tree branch.
I only saw the trailer, how is this movie called ?

last weak i little saw this movie A Perfect Getaway 2009 http://www.imdb.com/title/tt0971209/ but it's not comedy and story is little similar..

Nice, I will watch it thanks, but it is NOT that one.
The one I mean is new, It is 2010 or even 2011.
The trailer seems hilarious, they are killing themselves by far for no reason,

I don't know, maybe this one?





http://www.imdb.com/title/tt1465522/

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Yeah tnx dude!