The pretty girl from High School Musical, Zac Efron, and Lt. Dangle of Reno 911 fame have a movie coming out called 17 Again. Basically in the movie a guy in his 30's has some guru-type magic guy turn him back into his 17 year old self, and he goes back to high school. If you are old enough to remember Like Father Like Son with Kirk Cameron or Big with Tom Hanks than you've already seen this movie.
However, for those of you young enough not to have suffered those cinematic feats, here's a clip from Zac's film, which comes out in a couple of weeks. The reference to Kevin Federline is pretty funny, the rest I'll let you judge for yourself.