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" If you have quick verbal skills, use humor to deflect attacks. A quip instead of a counterattack can ease tension, reduce the impact of the other person's aggression, and help build the relationship. When in doubt, use self-deprecating humor such as, “Oh, I see, all you want me to do is to cave in, go belly up, and hand you everything you want. I guess I must come across as the weakest player in the universe.” And with tough bargainers, don't give in too soon; otherwise they might worry that they could have gained more and left too much on the table. In such cases, you must let them believe that they have wrested every last concession from you. "
― , Influence Without Authority