THEM: i can let you have the hat and one of the books.  YOU: must have ball  THEM: unfortunately the ball is the most valuable for me. i can give you the hat and two books.  YOU: books are 0 for me - no deal  THEM: that's unfortunate. there's no way i can let you have the ball.  YOU: no deal can be agreed then  THEM: i hate it when that happens. i can give you everything else if i get the ball. my best possible offer.  YOU: i can't agree to a score of less than 5  THEM: exactly. that ball is more than 5 for me so i have the same problem.  YOU: we just chose the no deal button  THEM: yes.