In situations in which a temporary set of rules are necessary, Rule 13 shall always be "No one shall say bad things about another person". In addition to establishing a standard level of civility, it also forces the situation to have a minimum level of structure by requiring at least 12 other rules be created.
Woman: im going to be pooh beat for halloween what are you going to be?
Woman 2: slutty pooh bear, because everything has a slutty halloween costume its rule 11 didnt you know?