This is one of my favorite movies of all time, right up there with Wrongfully Accused.
Way funnier if you've never seen it, but still excellent if you have.
It's rather laid-back, giving you time to breathe, as well as develop the characters, but also hit you hard with hilarious scenes that will stay with you forever.
The story is actually decent, but where it really shines is in the tempo of the film as well as the execution of the actors' roles; the movie never gets boring, and the characters are played brilliantly!
Be warned, though, not for children. I'd say most teens these days hear and see worse in online video games (long time gamer myself), so unless you're super uptight about foul language and sex, I'm gonna say teens should be able to handle this movie (saw it when I was 15; missed a ton of adult jokes).