It's got a couple of classic bits and gross outs, and if you don't know what they are then you've not been paying attention to the buzz this movie's been getting. Everyone's (well, not everyone) talking about the scene where Ben Stiller gets his nuts caught in a his zipper.
Everyone's talking about the scene with Cameron Diaz and a wad of semen dangling from Stiller's ear.
Funny as hell.
The plot's a bit weak (It's a love story! With stalking and bodily fluids!) but the laughs - and they are plentiful, I assure you - more than make up for it. It shouldn't be taken seriously, though. It makes fun of the mentally handicapped and generally reduces every character to new levels of shallowness, but if you realize that it's just a movie, you'll be fine.
Besides, it's funny.
Stiller's a bit dry, although I do think more of Cameron Diaz as an actress than I did before. You do wonder why she's into guys that every girl in the world says she wants to avoid, though.
Regardless, it's one of the funniest movie of the year.Go see it.