Knock knock. Who's there? Wu

Wu who? Wu don't know, I'm having an identity crisis!

Knock knock. Who's there? Dough.

Dough who? Dough-n't worry, I knead to come in.

Knock knock. Who's there? Flake.

Flake who? Flake out, I'm tired of waiting!

Knock knock. Who's there? A pause.

A pause who? No, just a pause. The joke's over.