The ten commandments of Halo
1. Thou shalt never chat in all caps, for any reason.
2. Thou shalt not accuse other people of being noobs whenever they kill you. Simply accept the fact that there are other people out there better than you.
3. Follow the requests of the game host. If banshees are not allowed due to excessive lag, do not use them.
4. Thou shalt not betray a teammate purposely
Corrolary to #4: In the event that you betray a teammate accidently, thou shalt apologize immediately. Also, thou shalt not join games for the single purpose of betraying others.
5. Thou shalt not run forward while firing the flame thrower. To do so is crispy and stupid.
6. Thou shalt not be ignorant of nearby threats (i.e. vehicles) while sniping.
More, anyone?