Knock, knock.
Who's there?
Jerk.
Jerk who?
This website who!
"Knock, knock." "Who's there?" "Knock, knock." "Knock, knock who?" "Can you let me in now?"
Knock, knock.
Who's there?
Madam.
Madam who?
Madam foot got caught in the door, can you please open it!
"Knock knock."
"Who's there?"
"Steve!"
"Steve who?"
Steve cries, aware that his grandmother's Alzheimer's has reached a point where she can no longer remember him.
I get knocked down, but I get up again, as long as I have 46 chromosomes.
Spock went to the Enterprise's toilet and he knocked on it. "Kirk, are you in there?" Spock asked.
Kirk answered, "Hold on, I am making a captain's log."
Why couldn’t little Susie stay on the swing?
She had no arms.
Knock knock.
Who’s there?
Not Susie.
The guy who made the knock knock joke deserves a no-bell prize.
Knock it out, you poo-a-loo, go get your loo.
Why did Sally fall off the swing? Because she had no arms.
Knock, knock. "Who's there?" Not Sally.
Q: How do you make a 9/11 cocktail?
A: Light two Manhattans on fire and then knock them over.
Knock knock. Who's there? Ligma. Ligma who? LIGMA BALLS!
Knock knock! Who's there? Deja. Deja who? Knock knock!
Yo mama's so poor, I knocked on the front door of her house and realized I was already outside in her backyard!
How do you knock out 26 kids in one punch?
You give them a Sandy Hook.
"Knock, knock." "Who's there?" "Your mother." "Duh!"
Knock knock.
Who's there?
Theodore.
Theodore who?
Theodore is locked, that is why I knocked.
Knock knock.
Who's there?
Robin.
Robin who?
Robin you, that is who.
Knock knock.
Who's there?
Apaches.
Apaches who?
Apaches on your eye.
Knock knock.
Who's there?
Por que.
Por que who?
"That's all, folks," in the words of Por que Pig.
