Qwi-Gon: "Hmmm . . . I've got a better deal. I give you the money for the ship, and we call it a day."
Watto: "Why should I?"
Qwi-Gon: "Laser sword."
silent pause . . .
Watto: (grumble) "All right. Just give me the money and go."
Qwi-Gon: "See, they ARE good for diplomacy."