Knock knock. Who's there? Leaf.

Leaf who? Leaf me alone, I'm busy!

Knock knock. Who's there? I'm not sure.

I'm not sure who? I'm not sure who is asking, can you please state your full name and the purpose of your visit?

Knock knock. Who's there? Wu

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

Knock knock. Who's there? Fig.

Fig who? Fig-ure it out yourself, I'm busy!