Jaden Smith and Jackie Chan in The Karate KidTHE KARATE KID

The opening scenes in director Harald Zwart's The Karate Kid remake, with the preternaturally confident and magnetic Jaden Smith taking over the Ralph Macchio role, are really good. But your first indication that the movie might wind up being really great - or, at the very least, a really great time - comes with its introduction of Mr. Han, the Pat Morita substitute played here by Jackie Chan.

Kevin Spacey and Jim Sturgess in 2121

Based on the Ben Mezrich nonfiction Bringing Down the House: The Inside Story of Six MIT Students Who Took Vegas for Millions, the film 21 boasts a far snappier title, yet I wouldn't recommend viewing it if you're even a day older than that. It's not often that a true story is re-told with such aggressive fraudulence, but 21 is a rare and rather spectacular failure - one in which your bullshit detectors wail at you early on and don't stop until you're rendered nearly deaf. The movie is directed by Robert Luketic, who also helmed Legally Blonde, and it's all just slightly less believable than Legally Blonde.