Customs need not be made by governments, and they need
not be written down. We learn how we should behave in society through the
instruction of family and teachers, the advice of friends, and our own
experiences. Sometimes, we can break these rules and do not suffer any
penalty. But if we continually break the rules, or break a very important one,
other members of society may criticize us, act violently toward us or refuse to
have anything to do with us. The ways in which people talk, eat and drink, work
and relax together are usually guided by many such informal rules which have
very little to do with laws created by governments.