Knock knock. Who's there? Pane

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

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? Canoe.

Canoe who? Canoe believe how many puns I can *canoe-dle* into one joke? I'm practically a *canoe-isseur* of wordplay!

Knock knock. Who's there? Harry.

Harry who? Harry up and open the door!