Lots and lots, including Tamagotchis!
Whatever goes upon two legs is an friend.
Whatever goes upon four legs, or has wings, is a friend.
No Tamagotchi shall wear clothes. Unless they were born with them.
All Tamagotchis shall sleep in a bed. Except babies.
No Tamagotchi shall drink alcohol. Just no, okay?
No Tamagotchi shall kill any other Tamagotchi. I don't think it's even possible.
ALL TAMAGOTCHIS ARE EQUAL. AND NONE ARE MORE EQUAL THAN OTHERS.