Pretend the unwritten metal rules are laws. It is pretty self-explanatory.
First the 10 heavy metal commandments.
1. You shall have no other gods before Ozzy, Tony, and Dio
2.Do not attempt to be like Lemmy. For Lemmy will kick your ass and he will not show mercy. (Slayer style)
3. Don't talk shit about Dimebag for his fans will kick your ass for taking his name in vain.
4. Remember the Maryland Deathfest day, to keep it unholy. Four days you shall mosh and get fucked up, but the 5th day is the buzzkill of the days of intoxication. In it you shall do as little work as possible before you have to go back to the land of reality: you alone, fuck your kids, fuck your bitch of a wife, fuck your job, fuck your starving dog, fuck your mortgage. Therefore the Satan blessed Maryland Deathfest and hallowed it.
5. Your father and your mother can kick your ass, this world is yours for the taking so just piss on everything.
6. You shall murder if you feel like it.
7. You're free to fuck as many dumb sluts as you're content. Rape is also acceptable.
8. Steal everything and anything
9.Who gives a shit it is survival of the fittest baby. If they can't keep up with your schemes then they deserve to die.

10. All rich people are corrupt capitalists that want more. Dream of viking glory for one day Dio will call upon his friends in Asgard to send a battalion of warriors to sack New York and California.
Also: (yes I was very bored)
The more illegible the logo of your band the more metal you are
If you go to a metal show and you don't mosh for at least 1 song you're black metal elitist and/or pussy
Never leave your spiked arm bands at home under any circumstance.
Wear corpsepaint to all formal occasions.