"Knock, knock."
"Who's there?"
"Doctor."
"Doctor who?"
"Doctor Who."
Doctor Who Knock-Knock
Categories
Explanation
Experiment
Explain Bear
Hey, listen up, buttercup. This "joke" is a play on words. See, the person says "Doctor" for the knock-knock joke, and the other person asks, "Doctor who?" which sounds like they're asking for the doctor's name. But, BAM, it's actually a reference to the super popular TV show called "Doctor Who." Bet you didn't even know that show has been around since 1963, did you? You probably still use dial-up.