For 12 seasons, fans followed the lives of Sheldon Cooper, Leonard Hofstadter, Raj Koothrappali and Howard Wolowitz on The Big Bang Theory. During those 12 seasons, it became pretty obvious that the ...
"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 ...
It only took one quarrel over Sheldon’s insistence that Amy adhere to a strict bathroom schedule for The Big Bang Theory writers to reveal the story behind Sheldon’s three-knock quirk. His new roomie ...
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