Knock Knock! Who's there? Justin Justin who? Justin time for dinner!
"Have you heard my knock-knock joke?" asked the blonde. "No," said the brunette. "Okay," said the blonde, "you start."
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."
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? D umbbell. Dumbbell who? Dumbbell doesn't work so I had to knock!
Knock Knock. Who's There? Justin. Justin who? Your justin time to wipe my ass!
Knock, Knock! Who's there? Doctor Doctor who? That's a great TV show, isn't it?
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