My friends and I have "The Orgasm Game". It's like Bipper's penis game. Basically, whenever you're doing a test, or are being forced to be silent, every now and then you make an obviously fake and would-never-actually-sound-like-that-but-it's-obvious-what-we're-trying-to-pull orgasm. You friend then makes a squeakier, or deeper orgasm, with increased sound. It is, quite frankly, the best game ever.