My wife tagged me with a meme, so I have to write my rules.
1. Do not make the same mistake twice.
2. Call it like you see it.
3. Be a good sport. Be gracious when you lose and even more gracious when you win.
4. If you dish it out, be prepared to take it.
5. Think. Above all else, think things through.
I'm not a big golden rule person. "Do unto others as you would have them do unto you" doesn't work if you are a masochist (with apologies to Richard Bach).
Martin, Michael, you're up.