Lord I remember when I was a kid in elementary school we had kids selling cinnamon tooth picks. I guess that would get you thrown out today and what about pitching pennies, gambling, we did that to.
When my kids were in Middle School there was a kid that used to buy a couple of dozen Double Bubble Gums on the way to school for 2 cents each and sell them to kids,during the school day,for 5 cents each.