Knock knock. Who's there? Leaf.

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

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?

Knock knock. Who's there? Pane

Pane who? I'm having a window of opportunity to let you in.

Knock knock. Who's there? Fig.

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