Quote from Ross in The One with All the Jealousy
Ross: What, uh, what's Mark doing answering your phone? Rachel: Oh, he's just goofing around. Ross: Oh, that's- That's funny. Why isn't he goofing around in his own office? Rachel: Ha, ha. Honey, this is his office, too. I told you, we're Joanna's two assistants. Ross: Why does Joanna need two assistants? How lazy is she?