Knock knock. Who's there? Amos.

Amos who? Amos *astounding* fact about puns is that Amos *clever* one is Amos *likely* to make you *a-moan*!

Knock knock. Who's there? Isabelle.

Isabelle who? Isabelle not ringing, what happened to your doorbell?

Knock knock. Who's there? Accordion.

Accordion who? Accordion to the weather report, it's going to rain!

Knock knock. Who's there? Alpaca.

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