The rules for gunfighting. Just in case you needed them. There are 28 here.
1. Forget about knives, bats and fists. Bring a gun. Preferably, bring at least two guns. Bring all of your friends who have guns. Bring four times the ammunition you think you could ever need.
10. Someday someone may kill you with your own gun, but they should have to beat you to death with it because it is empty.
21. Be polite. Be professional. But, have a plan to kill everyone you meet if necessary, because they may want to kill you.