During a recent taping of the hit show, Big Bang Theory cast decided to play a little prank on the show runners and the audience. The prank in question? A “Call Me Maybe flash mob”. while they did lip sync it, it was completely choreographed and the whole cast of Johnny Galecki, Jim Parsons, Kaley Cuoco, Mayim Bialik and the rest all got into the action. At the very end, Jim Parsons ended the joke as only his character, Sheldon Cooper could.