Cabin In The Woods
Go see it.
It's as good as LabRat said.
I refuse to tell you anything about it, because it's best for you to go in cold.
I will say this: if you've heard that it's a horror movie, and don't want to see it because you don't like that genre*, go see it anyway. One can explore a genre in a new way.
If you like Joss Whedon, you will love this.
I fail to understand why this flick is not getting more buzz. Go see Cabin In The Woods.