This black graphic t-shirt features a bold, distressed design with the classic "Knock Knock, Who's There?" joke. The punchline "DOCTOR. doctor who? YES." is prominently displayed. The text is a combination of red and gray, giving it a vintage, slightly worn look. Made from what appears to be a comfortable cotton blend, this short-sleeved tee is perfect for casual wear and a great conversation starter for fans of the iconic show. Show off your wit and fandom with this unique and eye-catching t-shirt.