We just watched the Danish film Klown in movie club. It's definitely not for everyone. Try to imagine Lars von Trier making The Hangover but it's about a canoe trip and not a stag party, and there's a 12-year-old boy present. You've got one crazy canoe ride on your hands. I thought it was hilarious, but you might think it's offensive, disgusting and maybe illegal. But I think we'll agree that the characters are horrible people.
Rent it from 9th Street Video (on Hitt).