Healers: Don't offer to heal an instance for which you are terrifyingly unprepared. Utgarde Pinnacle is the last instance before raids - don't go in there with mostly greens! When you do fail at healing an instance, don't immediately blame the tank's defense rating. Especially if its capped.
Hunters: Pet aggro gets turned off as soon as you enter an instance. No, I don't care about your "aggro fine tuning". You don't purposely try to pull off the tank!
DPS: The minimum acceptable DPS for a heroic is 1.2-1.5k. Don't gather a group of buddies with 700-900 DPS each and expect to live very long. When you die, don't blame the tank. My job is to keep aggro off you, not make up for shitty damage.
Vent users: Don't come into my guild's channel and ask to cyber with the hot chick. I will slap you so hard your connection will drop.
Allies: If you steal my mining node, that's fine. You were faster, and got there before me. But don't do a victory dance in fornt of me and call me a "l o s e r" with your kiddie-spacing. You, a 68 gnome rogue, were flagged. I, an 80 undead death knight, SCHOOLED YOU. I especially enjoyed camping your corpse for nearly twenty minutes.
Tanks: Generally, casters will call out when they need mana. Since casters are your DPS/healing base I highly reccommend you wait for them. So when you pulled that boss before we were ready, after we had called out to wait? Yea, we left the instance. We had less than 10% mana each. You died, you bitched at us, you got kicked out of the group. :)
Noob of the Week!
Kidoz - You're a caster. Stop running up with the tank, especially when they are trying a line of sight pull. You attacked the wrong marked target and your demon kept them in the room with stun and aggro, even though I asked you to turn them off. We wiped twice because of this bullshit, then you started to yell at me for not saving your squishy ass. FYI, everyone in the group messaged me and agreed you are a turd, which you proved accurate again a few days later when you came to Heroic AN with under 800 DPS and said "Its fine, its only a heroic." You, sir, are a noob.