The Big Bang Theory (also abbreviated as TBBT) is an American sitcom created by Chuck Lorre and Bill Prady, both of whom serve as executive producers on the show along with Steven Molaro. All three also serve as head writers. The show premiered on CBS on September 24, 2007. The ninth season premiered on September 21, 2015. Wikipedia
(repeated line when Sheldon tells a sarcastic joke) Sheldon: Bazinga!