Big Bang Theory Sheldon – Knock Knock Penny T-Shirt

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This is probably my favorite running gag on THE BIG BANG THEORY!  (See the video above for a montage.)

Entertainment Earth is already Sold Out of Medium size, but they still have the other sizes available. ¬†Order yours before they’re gone!

Click here to order your Big Bang Theory Sheldon – Knock Knock Penny T-Shirt from Entertainment Earth!