Knock knock. Who's there? Alpaca.

Alpaca who? Alpaca the bags, we're going on vacation!

Knock knock. Who's there? Hearse.

Hearse who? Hearse a real groaner for ya: I used to be a baker, but I couldn't make enough dough to roll with the big timers!

Knock knock. Who's there? Nimbus.

Nimbus who? Nimbus sure I'm at the right door, the forecast said I'd find you here!

Knock knock. Who's there? Taco.

Taco who? Taco 'bout a good time!