Poor Susie! Q: Why couldn't Susie ride the swings? A: Because she has no arms! Knock knock. Who's there? Not Susie!

*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??