Knock knock. Who's there? Wheat.

Wheat who? Wheat you waiting for, let me in, it's a-maize-ing!

Knock knock. Who's there? Bye.

Bye who? Bye-gone conclusion, I'm leaving!

Knock knock. Who's there? Elijah.

Elijah who? A light bulb just went off, I've got a brilliant idea for a joke!

Knock knock. Who's there? Pane

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