I was talking with my mom today about how this is the parenting "trick" I remember most from my childhood. Anytime me and my sister had to share something (my mom would have one of us cut/pour/divide the item, and the other got first choice of which portion we wanted. I remember painstakingly making sure that when we shared a can of pop that those levels were perfectly even, or each half of the cookie was either exactly equal in size, slightly off, but one side appeared to have more chocolate chips. Now as an adult, I think it's quite clever, since we rarely fought about who's share was better, since the cutter always believed the pieces were equal and the chooser got to pick what they considered better, so nobody could really be upset.

Do you guys do this with your kids? Do you have any parenting methods that you distinctly remember from your own childhood?