The Real Reason Sheldon Knocks 3 Times on 'The Big Bang Theory' - ZergNet

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The Real Reason Sheldon Knocks 3 Times on 'The Big Bang Theory'

The Real Reason
Sheldon Knocks
3 Times on 'The
Big Bang Theory'

Ever since 'The Big Bang Theory' first debuted in 2007, fans have wondered why Sheldon Cooper knocks three times on a door before entering a room. Well, during Monday's episode, that question was...