From a burning crusade is a new hope.
Remember Reach.
I say the idiot who hammers you in the back intentionally. I'm a noob, still getting used to these types of games. I get maybe 4-5 kills in a Slayer games, about 10-15 per round in Grifball, and I have never been antagonized for being suckish. I just hate people who whack friendlies in the back just for ammo, because they're in the way, or just because they want to, or they're noobs.
EDIT: No, I'm not 10 years old.
[Edited on 02.18.2012 11:53 AM PST]