Knock knock. Who's there? Elijah.

Elijah who? A light bulb just went off, I've got a brilliant idea for a joke!

Knock knock. Who's there? Nana.

Nana who? Nana your business!

Knock knock. Who's there? Wait.

Wait who? Wait a second, I thought *you* were supposed to tell *me* who's there!

Knock knock. Who's there? An anticlimax.

An anticlimax who? Exactly.