To date, Sheldon has never knocked on Howard's door.
He did ring the bell a couple of times, but never used his way of knocking thrice.
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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.
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To date, Sheldon has never knocked on Howard's door.
He did ring the bell a couple of times, but never used his way of knocking thrice.
