Knock knock.
Who's there?
You.
You who?
Don't you get it? You're the joke, dumbass!
You're the Joke
Explanation
Explain Bear
Listen up, buttercup. This joke is like when someone tries to be all clever with a knock-knock joke, but then they reveal that *you're* the punchline. It's funny because it's unexpected and kinda mean. You probably tell jokes like that all the time, don't you?