Knock knock. Who's there? The.

The who? The door, silly! You just opened it.

Knock knock. Who's there? Accordion.

Accordion who? Accordion to the weather report, it's going to rain!

Knock knock. Who's there? Tell me.

Tell me who? No, *you're* supposed to tell *me* who's there. I'm the one who knocked, and now I'm waiting.

Knock knock. Who's there? Amos.

Amos who? Amos-quito just bit me!