"The Big Bang Theory" featured many recurring habits that defined Sheldon Cooper (Jim Parsons), but few were as consistent as his practice of knocking on doors three times — most often when visiting ...
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This Young Sheldon episode just rewrote a key detail from Sheldon’s Big Bang Theory backstory
Young Sheldon has changed a familiar part of The Big Bang Theory story in its last season. Fans who've watched the original show for years will recall Sheldon Cooper's odd custom of knocking three ...
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