Knock knock. Who's there? Silence.

Knock knock. Who's there? Accordion.

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

Knock knock. Who's there? No one.

No one who? Exactly.

Knock knock. Who's there? Wu

Wu who? Wu don't know, I'm having an identity crisis, but I'm paws-itive I'll fur-get about it.