Knock knock. Who's there? Egg

Egg who? Egg-cuse me, I'm cracking under the pressure to make a good pun.

Knock knock. Who's there? Isabelle.

Isabelle who? Isabelle necessary, or can I just walk right in?

Knock knock. Who's there? Existential Crisis.

Existential Crisis who? I'm not really sure, because the concept of identity and self is fleeting and meaningless in an infinite universe.

Knock knock. Who's there? Noah.

Noah who? Noah body's home, I'm ark-ing around for someone to let me in.