This rule thing used to burn me up. Some time ago when I was an MS, I was given by the PO a form to use when serving as chairman for the Public Meeting and Watchtower Study. I was told in a very stern tone "use it." I looked at it and could tell it was not produced by the org - just something somebody in the field produced. I refused to use it.
Funny about the cowboy boots (mentioned in a post above). The same PO mentioned in my first paragraph made a rule outlawing cowboy boots. Then a circuit overseer came along and wore them during parts at a district convention (he was actually the convention chairman - head of the convention). Soon after, the PO was wearing cowboy boots during parts.
Other rules: Never work alone in service (clearly contrary to org instructions). Do not sit in backrooms during meetings. Do not sit on back rows at KH. Do not call anyone "brother" or "sister" unless baptized (clearly contrary to KM question box). If take break in service of 15" or less, do not have to stop time.