Simple to perform, produces hilarity for hours. First, turn on your video camera. Next, you engage in anal sex with your partner, but bring a friend secretly. Make sure that you are near a window. As you are about to dispatch your men, pull out and let your friend in on he deed. Try not to let her notice. Run outside to the window and make a silly face at her. Hilarity ensues. Ten points.
While giving Sam's litle sister a Phantom Friend, I punched a hole through the window and gave her a bloody nose.