Rachel: I'm not feeling really well... I don't think I'm gonna get to go to the play.
Ross: Really? What's wrong?
Rachel: I dunno... I think it's kinda serious... Oh, y'know... I was watching this thing on TV this morning about... Newcastle Disease? ...and I think I might have it.
Charlie: Uh, Newcastle Disease is a secretion borne virus that only affects chickens and other poultry.
Rachel: (pointing to Charlie) Okay, who's this?