Knock knock. Who's there? Orange

who? You know what, I just realized I forgot the rest of the joke. Can I get back to you?

Knock knock. Who's there? An incomplete thought.

An incomplete thought who? An incomplete thought about... what was I saying?

Knock knock. Who's there? Etch.

Etch who? Bless you!

Knock knock. Who's there? Bye.

Bye who? Bye-gone conclusion, I'm leaving!