Knock knock. Who's there? Sew

Sew who? Sew long, I've been trying to weave a good joke together.

Knock knock. Who's there? Flake

Flake who? Snow-body's home.

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.

Knock knock. Who's there? Silence.