No spoilers here.
The film makers made it very clear that they didn't want anyone sharing the secret behind The Cabin in the Woods when it first premiered. Therefore, I'm not going to reveal any of the plot details besides the basic premise here. It's so much more fun to see it for yourself.
Five college kids (including Thor's Chris Hemsworth and Grey's Anatomy's Jesse Williams) are going on a weekend getaway to a remote cabin in the woods. Obviously this entire idea spells trouble. But there's something much more sinister behind all of this.
When we got out of the theater the word that everyone seemed to agree on to best describe this was "clever." Clever it is. How this movie sat on the shelf for so long is beyond me. I read that the studio wanted to convert it to 3D, but Joss Whedon was against it. Also the studio ran into financial problems, etc. Either way, I'm happy this little horror flick got to see the light of day, because it is far to good to sit and wait.
Memorable *spoiler free* quote: "He has a husband's buldge." - Marty (Fran Kranz)