This black t-shirt features a fun "Knock Knock" joke design related to the popular television show, Doctor Who. The phrase "Knock Knock. who's there? DOCTOR. doctor who?" is prominently displayed in white and orange font. The shirt appears to be made from a soft, comfortable cotton blend. The playful design is perfect for fans of the show. This shirt is ideal for casual wear, conventions, or showing off your fandom. It also makes a great gift for any Doctor Who enthusiast. Wear your love for the Doctor with this fun and unique tee!