Knock Knock Joke Generator

"Knock, knock." "Who's there?" You already know the rest — and now you'll never run out of them. The Pranksters.com Knock Knock Joke Generator gives you an endless supply of the most beloved call-and-response joke in the world, with a fresh one every time you tap Generate.

The knock-knock joke is a genuine piece of comedy history. It's a five-line wordplay format that became a nationwide craze in the United States in 1936 and never really left — because it's interactive. Unlike a joke you just read, a knock-knock joke needs two people: one to knock, one to answer. That back-and-forth is what makes it perfect for kids learning wordplay, for breaking the ice, and for getting an easy laugh at any age.

How the format works. Every knock-knock joke follows the same five beats: you say "Knock, knock," your friend says "Who's there?", you give a name or word, they repeat it with "…who?", and you land the pun. The magic is all in that final line — a play on words that turns an ordinary name into a groan-worthy punchline.

Pick your flavor. Not every knock-knock joke fits every room. That's why we've built dedicated categories: clean jokes for kids, cheekier ones for adults, corny dad-style groaners, flirty ones for a crush, and spooky Halloween editions. Choose a category and every joke you generate will match that vibe.

How to use it. Tap Generate for a new joke. We'll show you the setup, and you reveal the punchline with a click — just like telling it in person. Tap Copy to grab the whole joke, or Share to send it to a friend and start the "who's there?" exchange yourself. No sign-up, no limits. Want more laughs after? Try the Dad Joke Generator, the Kids Jokes Generator, some quick one-liners, or a Pickup Line Generator opener.