Knock knock. Who's there? Pane

Pane who? Pane-de-monium, I'm having a window of opportunity to tell you a glass-half-full joke!

Knock knock. Who's there? Olive.

Olive who? Olive your jokes are so funny!

Knock knock. Who's there? Alpaca.

Alpaca who? Alpaca the suitcase, we're going on vacation!

Knock knock. Who's there? Ego.

Ego who? Eggoing to let me in, or is that just a waffle excuse?