Knock Knock! Who's there? Zany Zany who? Zany body home?
"Knock, knock.Who's there?" very long pause... "Java."
Knock, Knock! Who's there? D umbbell. Dumbbell who? Dumbbell doesn't work so I had to knock!
Knock knock. Who's there? Sarah. Sarah who? Sarah problem here?
Knock knock. Who's there? Kenya. Kenya who? Keeeenya feeel the loooove tonight?
Knock knock. Who's there? Déja. Déja who? Knock knock.
Knock-knock. Who's there? To. To who? No, to whom.
Chuck Norris was once part of a knock knock joke. The Joke ended abruptly when after the first knock the door blew up killing the man behind it.
Knock knock. Who's there? FBI. FB… We are asking the questions here!
Fan: "I see you won a silver medal at the Olympics. What's it for?¨" Athlete: "It's for telling knock knock jokes." Fan: "And what's that gold medal for?" Athlete: "For stopping."