Knock Knock Who's there? Adolf! Adolf who? Adolf ball hit me in the mouth! 1690. Knock Knock Who's there? Aesop! Aesop who? Aesop I saw a puddy cat! 1691. Knock Knock Who's there? Abe! Abe who? Abe C D E F G H...! 1692. Knock Knock Who's there? Abyssinia! Abyssinia who? Abyssinia behind bars one of these days! 1693. Knock Knock Who's there? Alberta! Alberta who! Alberta'll be over in a minute!

*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??