Kaley Cuoco Serenaded Jimmy Fallon With The Big Bang Theory Theme Song

Do you know all the words to the Big Bang Theory theme song? Kaley Cuoco's recent television performance proved she does. The actress, who portrays Penny on the long-running sitcom, sat down for an interview with Jimmy Fallon on The Tonight Show, only for the conversation to turn musical. After sharing some hilarious behind-the-scenes photos with the audience (apparently, Cuoco has no idea how to not stare directly into a camera, despite being an actress who theoretically does so all...