Knock knock. Who's there? Fig.

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

Knock knock. Who's there? Tank.

Tank who? Tank you for opening the door!

Knock knock. Who's there? Pane

Pane who? I'm glass you're excited to meet me, but I'm a little transparent about my feelings.

Knock knock. Who's there? Purpose.

Purpose who? That's what I've been asking myself for years.