Get on the Groundlings' email list: Each week this improv show sells out the day its cast is announced. Current regulars include the hilarious Jordan Black, Stephanie Courtney (aka Flo, the Progressive girl), and Oscar-winner Jim Rash. Jonathan Kite (Two Broke Girls) and Steve Little (Eastbound and Down) are semi-regular favorites. And Will Ferrell, Hillary Swank and Kristen Wiig have all dropped in before. Even if it is sold out, Groundlings has a no-late-entry policy, so wait-listers frequently get to fill the seats of those suckers stuck in traffic.