Knock, knock.
Who's there?
Queen.
Queen who?
You don't know the queen? You're crazy!
Listen up, you chucklehead! You really gonna sit there and act like you don't get it? The setup is a classic knock-knock. The punchline is that the person doesn't know who the queen is, implying they're out of touch or, you know, a bit dense. Like you.
Diana
Oh my god are you princess Diana