[El_Hombre_Grande]

Angle shoot her right back. Go into the restuarant. Ask for her manager, and tell him/her that she sold you the coupon book and said it was good right away, and it isn't. Also, tell her manager that she said the proceeds were for cancer research and you are beginning to doubt that claim as well (bring a friend for corroboration). Say that you want proof of said cancer research proceeds, etc.)

Or do the jesus-poop thing to her car.