Just as I was withdrawing money in a bank lobby, my 5-year-old daughter chose to throw a temper tantrum, screaming and writhing on the floor while a couple of elderly ladies looked on in disgust. (Their children, apparently, had been perfect.) I gave Dorothy a disappointed look and said, “That argument won’t work, sweetheart. It isn’t pathetic enough.” She blinked a couple of times and picked herself up off the floor, pouting but quiet.