Knock Knock Knock Penny Sheldon Cooper Inspired Mens Unisex T-Shirt

If 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 people enough time to get their pants on!

Our Mens/Unisex style T-Shirts come in a regular fit and are 100% Cotton. Sizes range from Small - XXL. Please check out our size guide to make sure you get the best possible fit. This is an inspired by design and is not official merchandise.