I spend 90 percent of my time saying no, and my accountant yells at me for it, but when I started in this business, I wanted my career to have legs.
At one time, whenever the hell it was, they wanted a character to come in and stir up the pot. They brought me in for 8-10 episodes and said we'll try it for that.
First they ignore you, then they laugh at you, then they fight you, then you win.