Knock knock. Who's there? Alpaca.

Alpaca who? Alpaca the suitcase, you load the car!

Knock knock. Who's there? Dew.

Dew who? Dew-n't worry, it's just a drop in.

Knock knock. Who's there? Repeat.

Repeat who? *sigh* Fine. Knock knock.

Knock knock. Who's there? Sew

Sew who? Sew glad you asked, it's a tailor-made joke!