We took my sons, ages seven and five, up to Friendship Park for a picnic.
My seven year old read the sign with the playground rules to his brother.
"Do not jump on the merry-go-round when in motion."
"Go down the slide while sitting, only."
"Only one child on a swing at a time."
(There were a good twenty rules.)
The boys promised to obey them if I would let them play without Daddy standing by. So, I joined my wife at the picnic table.
Just before it was time to eat, I went over and watched them play. They were obeying the rules, that is, all but one. On the tall semicircular slide, they were coming down head first!
I took them over to the posted regulations. We read them, again. I asked the boys what they had to say for themselves.
"Oh, don't be silly, Dad...no one uses the slide rule anymore!"
Orginally from Thorn Shunt.