Paul: Just like that: bing, bang, boom?
Jamie: At this point, I'd settle for the boom.
Paul: You don't want the bing and the bang?
Jamie: I did when we started.
Paul: And now?
Jamie: I'm over it.
Paul: You're a very complex woman.
Jamie: You don't want the boom?
Paul: 'Course I want the boom. Guys always want the boom. We only made up the whole bing and the bang just to get to boom.
Jamie: Do you want to tell me why I just lied to our closest friends?
Paul: They wanted to take us to dinner.
Jamie: The Bastards.
Jamie Buchman: We're having lasagna. There is a recipe in the back of a Rice Krispies box.
Paul: All I know is I wanna wake up naked with you for the rest of my life.
Jamie Buchman: You are a strange, amazing man.
Paul Buchman: What's the big deal with Valentine's Day? It's a made-up holiday. Nobody even knows who this St. Valentine guy was.
Jamie Buchman: He was a Roman priest who defended the Christians and was beheaded by Claudius II on February 14, 269 A.D.
Answer: Just think about your own life, I am sure you do not act the same with your siblings or close friends as you do with a stranger (because that is what the Buchmans essentially are to Ursula). In Mad About You, she is an extremely bad waitress and in Friends she is a jerk - those are not mutually exclusive character traits. This can also be seen in the Friends episode when Jamie and Fran are in Central Perk and run into Phoebe who answers their questions in an aloof manner and they assume it's Ursula. Is Phoebe always aloof? No. But she was to strangers asking her weird questions. Also, Ursula has been aloof with Phoebe as well (like in the one where they all turn 30 or the one where the grandmother passes away, etc).