Quote from Ross in The One with the Joke
Ross: Hey, check it out. It's the first one, too. Chandler: That is funny. It was also funny when I made it up. Ross: What? Chandler: I made that joke up. Ross: Um, oh oh, no, you didn't. Chandler: Uh, uh, oh. Yes, I did. I told it to Dan at work and he said it was the funniest he'd joke ever heard. Ross: Hey, tell Dan thanks.