knock, knock

Sophia: Knock knock!
You: Who's there?
Sophia: Auntie.
You: Auntie who?
Sophia: Hyeson.

A variation:
S: Knock knock!
Y: Who's there?
S: Mommy.
Y: Mommy who?
S: Hyeyoung.

Another variation:
S: Knock knock!
Y: Who's there?
S: Uncle (or phonetically, "un-tall")
Y: Uncle who?
S: Untall Turtiss (Uncle Curtis).

All three variations inevitably concludes with a big round of belly laughs from our comedian herself.