Knock Knock.

Knock-knock.
What?
Knock-knock.
What are you talking about?
Knock-knock. You know, the knock-knock joke.
I don't get it.
You've never heard of the knock-knock joke?
No.
Oh, come on. Are you serious?
Yes. What knock-knock joke?
How could you not have heard of it?
There's ten trillion things in the world. Have you heard of every one?
Well, OK. I find it hard to believe, but.... I go knock-knock and you say who's there. Then I say something and you repeat it and say who after it.
Why?
Because it's a joke. You'll see. OK. Knock-knock.
Knock-knock who?
Not knock-knock who. You say who after the second part.
OK.
Say who's there.
Who's there?
Knock-knock.
Who's there?
Damn it, now I forgot the joke.
Damn it, now I forgot the joke who?
Don't say anything.
Don't say anything who?
Stop it.
Really stop it or stop it who?
Forget it. Forget the whole thing.
I'm sorry. I'll get it right.
Why don't I believe you?
Gimme another chance. I've never done this before.
Are you kidding me about that?
Are you kidding me about that who?
I knew it!
I knew it who!
That's it, I'm going.
Who's there?
Good bye.
I'm sorry. Come back! Knock knock!