Knock knock. Who's there? The author.

The author who? The author who's running out of names for these jokes.

Knock knock. Who's there? An anticlimax.

An anticlimax who? Exactly.

Knock knock. Who's there? Wire.

Wire who? Wire you not opening the door?

Knock knock. Who's there? No one.

No one who? Exactly. There's literally nobody here. I just wanted to see if the door was locked.