A few years ago M.G. would encourage M2 to eat carrots by telling him that the carrots would help him see better in the dark. He was impressed and would eat at least most of his carrots if she said that.
Today at lunch M2 told M3 that she shouldn't forget her carrots. "Don't you want to be able to see things better in the dark?"
She said, "No, I don't care if I see things in the dark. If it is dark I will just yell to someone to turn the light on."