Sheldon: Oh, dear, Mr. Why do these things always happen to me? I get my hair cut by Mr. You believe this guy?

Yes, you read that right. Sheldon Cooper is a wild man! His spot technically belongs to Sheldon so he throws a hissy fit and demands its return. After a call to the president of the university proves to be futile, he challenges Wolowitz at his own game.

Fans can't get enough of Sheldon and his gang of geeky pals. We've put together a collection of awesome facts about the sitcom that you might not have known, from the meaning behind Sheldon's shirts to the origins of 'Soft Kitty'. Unlike the other characters, Penny is the only one whose surname has never been revealed. Reports claim that Kaley Cuoco prefers to keep this a mystery throughout the whole series. Co-creator Bill Prady has said that the name will be revealed eventually, but producer Steve Molaro has said the opposite, so who knows.