21 Jump Street (15)

Starring: Jonah Hill, Channing Tatum, Ice Cube

There are some giggles in this odd-couple comedy, though reports of its coolness are greatly exaggerated.

Based on an old TV cop show that starred Johnny Depp, this has Jonah Hill and Channing Tatum as rookie cops told to crack a drug ring. To do so they must return to high school, disguised as students, only now they find teenagers rather different from what they remember. The gags keep coming even as the picture veers out of control, its chief handicap obvious from the outset: Hill can do comedy, and Tatum can't.