It's only logical that you should enjoy a good catchphrase! Every time you wear this officially licensed, 100% cotton t-shirt, you'll be imbued with the calculating intellect and sexual magnetism of Sheldon Cooper from "The Big Bang Theory." We're not sure how it works, but it's probably scientific. BAZINGA! Adult Green or Blue 100% Cotton Officially Licensed Standard Fit More 'The Big Bang Theory' items: The Big Bang Theory Merchandise Size chart