Knock Knock Knock Penny Sheldon Cooper Inspired Mens Unisex T-Shirt Colour:Navy This is a great statement

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Knock Knock Knock Penny Sheldon Cooper Inspired Mens Unisex T-Shirt Colour:Navy This is a great statementIf you are a fan of the hit TV show The Big Bang Theory then you will love this t shirt celebrating the infamous Sheldon Cooper knock! According to Sheldon, he suffered a childhood trauma because he didn't knock for long enough once and ended up walking in on his father cheating on his mother. Ever since then Sheldon has always made a point of knocking three times before opening a door. The first knock is customary, knocks two and three are to give