Knock knock. Who's there? Mango.

Mango who? Mango-nificent to meet you!

Knock knock. Who's there? Silence.

Knock knock. Who's there? Wu

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

Knock knock. Who's there? Homer.

Homer who? Homer-ly, who could resist a classic like this? It's an *epic* pun, don't you think?