Knock knock. Who's there? Dictionary.

Dictionary who? I'm not defining the terms of this conversation.

Knock knock. Who's there? Silence.

Knock knock. Who's there? Tank.

Tank who? You're welcome! No, seriously, *tank* you for opening the door; I was starting to lose my *bearing* out here.

Knock knock. Who's there? Waiter.

Waiter who? Waiter minute, I thought *I* was supposed to be asking who's there!