So with any law or set of rules people are going to bend or break them. What about the ones that aren't written down or really explained to you? If you break these unwritten rules you most likely won't get in trouble with the law or anything but you will either feel out of place or looked down upon. In this thread post unwritten rules and why they should or shouldn't be.
I'll give a few to start.
Paying with pennies- Sure you can do it and it is totally legal, but you don't pay for a $5-6 meal with all pennies, you just don't rough ridin' do it.
Buying food at one restaurant and taking it into another one and eating it there- Seen people do it, really frowned upon by the restaurant you didn't buy from.
Going to take a leak and pissing right next to another guy when you could put at least 1 stall in between you- It's just really rough ridin' weird.