THEM: i'd like 2 hats and a ball please.  YOU: im keeping the ball, you can have the hats  THEM: nah, that won't work for me.  YOU: then a hat and a ball?  THEM: i can do 2 balls and a hat or 2 hats and a ball  YOU: okay. 2 hats and a ball  THEM: okay deal, thanks.