Leonard plays laser obstacle chess with the guys. What is laser obstacle chess? Glad you asked. You must avoid the lasers in order to make your next move.
Sheldon: I'm a physicist. I have a working knowledge of the entire universe and everything it contains Penny: Who's Radiohead? Sheldon [after twitching for a minute]: I have a working knowledge of the important things
Howard: you know what would bea great idea? We get some girls over here and we play laser obstacle strip chess Leonard: Believe me howard, any girl who would want to play that, you don't want to see naked Howard: You underestimate me