The movie that launched a thousand slumber parties is back with a vengeance. The campiness, the fun and the music hold up even 20 years later. In fact, it's worth the price of admission just to see John Travolta swing his hips in the carnival Shake Shack while crooning "You're the One That I Want." Sure, Grease is on TV all the time, but there really is something to be said for seeing the gang from Rydell High back on the big screen in front of a captivated, er, participatory, um, hopelessly devoted audience. It really is where they belong.