The BBC reports that when Italian police searched a Mafia boss' hideout, they found a list of ten rules for proper mafioso etiquette.
1. No-one can present himself directly to another of our friends. There must be a third person to do it.
2. Never look at the wives of friends.
3. Never be seen with cops.
4. Don't go to pubs and clubs.
5. Always being available for Cosa Nostra is a duty – even if your wife's about to give birth.
6. Appointments must absolutely be respected.
7. Wives must be treated with respect.
8. When asked for any information, the answer must be the truth.
9. Money cannot be appropriated if it belongs to others or to other families.
10. People who can't be part of Cosa Nostra: anyone who has a close relative in the police, anyone with a two-timing relative in the family, anyone who behaves badly and doesn't hold to moral values.
Compare it to Gene Autry's Cowboy Code (from 1930), which I think is just about the best set of rules for living a good life that I ever seen:
1. The Cowboy must never shoot first, hit a smaller man or take an unfair advantage.
2. A Cowboy must never go back on his word, or a trust confided in him.
3. A Cowboy must always tell the truth.
4. A Cowboy must be gentle with children, the elderly and small animals.
5. A Cowboy must not adovcate or possess racially or religiously interolerant views and ideas.
6. A Cowboy must help people in distress.
7. A Cowboy must be a good worker.
8. A Cowboy must keep himself clean in thought, speech, action and personal habits.
9. A Cowboy must respect women, parents and his nations's views.
10. A Cowboy is a patriot.