Knock Knock Knock Penny Shirt

Knock Knock Knock Penny Shirt

Official Big Bang Theory Merchandise

This officially licensed black The Big Bang Theory t-shirt features Sheldon's notorious knock for Penny.

Sheldon isn't allowed to knock on Penny's door before 11am as she has a strict "I'll punch you in the throat" policy.

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Sheldon Shirts | Official Big Bang Theory T-shirts and Merchandise

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