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? Lettuce.

Lettuce who? Lettuce in, and we'll 'romaine' here all night, serving up 'head'-spinning puns until you 'leaf' feeling 'crisp' with laughter!

Knock knock. Who's there? Sherwood.

Sherwood who? Sherwood you let me in, it's chilly out here!

Knock knock. Who's there? An incomplete thought.

An incomplete thought who? An incomplete thought about... what was I saying?