Knock knock. Who's there? Alpaca.

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

Knock knock. Who's there? I forgot

who? Oh wait, I remember now, but it's not like it matters because I'm just going to forget again anyway.

Knock knock. Who's there? Dough.

Dough who? Dough-n't worry, I'm just here for the bread!

Knock knock. Who's there? Fig.

Fig who? Fig-ure it out yourself!