Knock knock. Who's there? Donut.

Donut who? Donut even think about glazing over this punchline; it's sure to be sweet!

Knock knock. Who's there? Blink.

Blink who? Blink and you'll miss this utterly tear-able pun about eye-popping humor, so prepare your ocular orb for an optic shock!

Knock knock. Who's there? Alpaca.

Alpaca who? Alpaca the suitcase if you open the door!

Knock knock. Who's there? Taco.

Taco who? Taco 'bout a good time!