You've seen Cartman do it. You've even seen Christopher Walken do it. But you haven't seen "Poker Face" done like this. Watch as U.C. Berkley's all-male A Cappella group "Noteworthy" performs the Lady GaGa hit (complete with mind-blowing choreography) at the 9th Annual West Coast A Cappella Showcase. The guy who pops out of nowhere to sing the chorus had us on the floor with every reprise!