The current rules on my forum:
Share everything.
Play fair.
Don't hit people.
Put things back where you found them.
Clean up your own mess.
Always say please and thank you.
Don't take things that aren't yours.
Say you're sorry when you hurt someone.
Wash your hands before you eat.
Flush.
Take a nap every afternoon.
When you go out into the world, watch out for traffic, hold hands and stick together.
Taken with liberties from "All I Really Need to Know I Learned in Kindergarten" by Robert Fulghum, my former minister at Edmonds Unitarian Church.