Knock knock

Knock-Knock Jokes

This joke does not work in print, you have to speak it to someone.

Knock knock.

Who's there?

Helen Keller.

Helen Keller who?

(Don't say anything).

Helen Keller who?

...you will get a laugh...ty.

Voldemort: Knock, knock.

Harry Potter: Who's there?

Voldemort: You know.

Harry Potter: You know who?

Voldemort: Exactly!