Knock knock. Who's there? The author.

The author who? The author who's running out of names for these jokes.

Knock knock. Who's there? Tank.

Tank who? Tank you for opening the door!

Knock knock. Who's there? Knock

knock.

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!