The most popular American Sitcom The Big Bang Theory is the one show you can't get rid of. Know a fellow fan? Get him/her Big Bang Theory items from The Big Bang Theory introduced Exclusively by PosterGuy. Shop The Big Bang Theory inspired gear like T-Shirts, Mugs, iPhone Cases, Mouse Pads and Posters and enjoy these Geeky and Quirky designs. Disclaimer: The Big Bang Theory Collection may encourage some hyper quantum physical activity!!