Sheldon had been knocking on Penny's door for years, and he'd even begun knocking on other neighbor's doors when they played their music too loud or their baby wouldn't stop crying, but one neighbor in particular wanted nothing to do with Sheldon's knocking ways.
This man called himself Heisenberg, and when Sheldon finally got him to answer the door he met with the big bang of a slap to the face from the irate bald man.
He yelled: I am the one who knocks! And Sheldon was so scared he stammered: W-w-who are you? To which the man replied: Heisenberg!
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