Kaylee: Have you ever had to service a really hideous client? With boils and the like?

Inara: A Companion chooses her own clients, that’s Guild law. But physical appearance doesn’t matter so terribly. You look for a compatibility of spirit. There’s an energy about a person that’s difficult to hide, you try to feel that ―

Mal: (walking in) And then you try to feel the energy of their credit account. It has a sort of aura.

Inara: What did I say to you about barging into my shuttle?

Mal: That it was manly and impulsive?

Inara: Yes, precisely. Only the exact phrase I used was “don’t”.

Mal: Well, you’re holding my mechanic in thrall. And Kaylee, what the hell’s goin’ on in the engine room? Were there monkeys? Some terrifying space monkeys maybe got loose?

Firefly – Episode 2 – “The Train Job”