Sheldon's trademark "Bazinga!" originated with writer Stephen Engel, who would set up playful practical jokes around the writers room, including putting together a grapefruit with tape.
"I'd open it up and Stephen would say, 'Bazinga,' " executive producer Bill Prady recalled. "It was Stephen's word for 'gotcha.' "
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Things You Didn't Know About The Big Bang Theory
FanfictionHere are some mind-blowing facts that you probably didn't know about The Big Bang Theory.