Why did Sarah fall out of the tree? Because she had no arms. Knock-knock! ""Who's there?"" Not Sarah.

*knock knock* whos there? sir theres been an accident. theres been an accident who?

"Knock knock." "Who's there?" "Doorbell repairman."

Knock knock?? Who's there?? Jehovah Witness. Knock knock?? Knock knock?? Hello?? Knock knock??