JOKE 1

Me: Knock, Knock!

Friend: Who's there?

Me: ...

Friend: Who's there?

Me: ...

Friend: Hello?

Me: Were you talking to me?

Friend: Yes, I said 'who's there?'

Me: Why, what did I say?

Friend: Knock, Knock.

Me: Who's there?

JOKE 2

Me: Knock, Knock

Friend: Who's there?

Me: Who's there?

Friend: Who's there who?

Me: Oh, sorry! Wrong person!