Ross: I'm really impressed that you were able to memorize all this so quickly.
Joey: I'm an actor. I can memorize anything. Last week I had to say "Frontal Temporal Zygomatic Craniotomy."
Ross: Wow, what does that mean?
Joey: No idea. But the guy I said it to dies in the next scene, so I guess it means, you're going to get eaten by a bear.
From the episode "The one with the fertility test", you can see the clip here (at about 7mins).