Knock knock. Who's there? Isadore.

Isadore who? Isadore a lock on this door, or is it just glued shut?

Knock knock. Who's there? This isn't a door.

This isn't a door who? Exactly, you're knocking on a wall.

Knock knock. Who's there? Uriah.

Uriah who? Uriah-lly didn't see that pun coming, did you?

Knock knock. Who's there? Wu

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