THEM: what if i get one of each?  YOU: i need the ball. you can have both books and i take the hats.  THEM: can't do that. how about i get the ball and one hat?  YOU: how about i get the ball and one hat.  THEM: can't do that. what if i get the ball and both books.  YOU: the ball is the only thing i can't move on. i need to keep it. how about i keep the ball and the two books.  THEM: i can't. i need the ball. what if i get the ball and you take the rest?  YOU: deal.  THEM: deal.