THEM: what if i take 1 book, 1 hat and 1 ball  YOU: no, i need the ball, you can have the rest  THEM: i can't give up the ball  YOU: wow, neither can i!  THEM: so i guess we can't reach a deal  YOU: bummer  THEM: sorry  YOU: no problem, but you checked deal was agreed when it wasn't, so i'm going to have to return this hit  THEM: i never checked deal agreed  YOU: hmmm, well i don't know what to do! i can't check deal not agreed, because it's not an option that is clickable.