I did not want to see this movie. I thought that it looked moronic and I love "Joe Dirt" and "Little Nicky". My kids were watching it one day, laughing their heads so I decided to see the fuss was about.
It is funny because it's true. There is always that one kid that never leaves the nest and has a little "Peter Pan" in him/her to not go out into the cold world and make his/her mark. Yes, the characters' behavior is very extreme, but that is for comedy purposes. There is a happy ending all the way around but the best part is Dale and Brennan grow up.
Bonus to this movie are all the one liners and the t-shirts that Dale and Brennan wear . . . Baby Boomers will get them ;)