In honor of 21 and Over, the latest party movie to hit screens, here are our 20 party movies worth watching. Some on this list are Party Movies, others are movies with a party in them. (We've arranged from least tolerable to the most tolerable.) We've thrown in the ones you know as well as a few unorthodox choices, and strangely Tom Cruise ended up here a few times, too. Ranked by Alan Scherstuhl, blurbs by Nick Lucchesi.