I told Benjamin and Noah this morning that they could each have twenty marbles for their marble reward jars if they could not fight with each other for the entire day.
I told them they'd only get ONE chance for the twenty marbles. If I had to separate them or tell them even once to stop fighting, that was it.
"Do you understand me?" I asked them.
"Yes, Mommy," said Benjamin. "It's like we already had a lot of chances, and this is our LAST chance."
Uh. Well. I guess if it helps you to see it that way....
(And by the way, Noah lost his chance for twenty marbles before we even got to school. He didn't last an hour.)