| Knock Knock Penny Adult T-shirt |
| "Knock, knock, knock, ""Penny?"" Any fan of the hit sitcom ""The Big Bang Theory"" will instantly recognize Sheldon's trademark knocking pattern from his frequent visits to Penny's apartment. Order your t-shirt now, and start annoying your neighbors with your attire in addition to your Asperger's. Black or Red 100% Cotton Officially Licensed Standard Fit More 'The Big Bang Theory' items: The Big Bang Theory Merchandise"
Price: 19.95  |