Doctor: Now, ordinarily, Mr. Tribbiani, we try to break the stones up with shock waves. But they're too close to the bladder. Which means we can either we wait for you to pass them or else go up the urethra-
Joey: Whoa, whoa. No, no, no, no. Nothing is going up, okay? Up is not an option. What's a urethra? [Monica whispers in Joey's ear] Are you crazy?

Ross: To be fair, he doesn't seem to be impersonating Fonzie-
Phoebe: What are you doing? Why are you defending him? Just get me another doctor who is not crazy and does not Fonzie.
Ross: Again, it's not that he-
Phoebe: Aah! Aah!

Doctor: Mr. Tribbiani, I'm afraid you've got kidney stones.
Joey: Well, what else could it be?
Doctor: It's kidney stones.
Joey: Or...?
Doctor: Kidney stones.