You thought Sheldon invented this variant of the traditional choosing game, didnt you? To be fair, it is exactly the kind of thing that hed do but no. This expansion to the more familiar game was invented by Sam Kass, a New Jersey software developer, with his friend Karen Bryla. The game has appeared in four episodes of The Big Bang Theory to date: the last, season fives The Rothman Disintegration, actually gave Kass a long-overdue credit in the shows dialogue. In case youre wondering, or youve simply forgotten, the rules go as follows: Scissors cut Paper; Paper covers Rock; Rock crushes Lizard; Lizard poisons Spock; Spock smashes Scissors; Scissors decapitate Lizard; Lizard eats Paper; Paper disproves Spock; Spock vaporizes Rock; Rock crushes Scissors. Follow that? No? Then let Sheldon help you out.Can you think of any more geek culture references that The Big Bang Theory has brought out into the mainstream? Let us know in the comments below