Knock Knock Knock Penny!

This Big Bang Theory shirt features a repitition of the words Penny! Knock Knock Knock. When Sheldon visits Penny he announces himself by summoning Penny and knocking three times. He repeats this pattern until an exasperated or amused Penny finally opens the door.

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Knock Knock Knock Penny!

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Hashtags: #knock #penny #sheldoncooper #thebigbangtheory #tvshow #typographic