This is an excellent, but bloody movie. It has a very good message about trying to say positive things, not negative, and messages about you are more handsome than you think you are.
Although it has this great message, there is a bit of profanity (not loads of it, but an occasional thing here and there), and violence. Although there's only one character that is actually violent, yet he never really kills anyone. The only killing is really just one mistake after another, such as not looking where you're running and impale yourself on a branch. People are seen drinking and driving. And finally, some casual flirting.
So really, a great message, that's pretty funny. 15+. Also, there's a lot of death that, if you think about it, is kind of funny. I don't think young kids should be exposed to this kind of humor.