How to Behave in a Random Group

• Wait a minute. When you get started running the instance, people might need a few seconds. Many healers do not hang around all the time in their healing gear and spec. Some people have discovered that wearing junk gear is a good way not to end up in HoR and need to put on the good stuff. Everyone might like to eat. Quickly confirm everyone's readiness before beginning.
  
• Everyone defers to the tank. It doesn't matter who the party leader is. DPS and healers should wait until the tank is ready to pull. They should stand where the tank indicates. And if the tank says they don't want to do an achievement, then that achievement isn't happening. Further, DPS should make a point to target what the tank is focusing on. Your death is your own fault if you don't.
• The tank defers to the healer. This means that the tank needs to keep an eye on the healer's mana and the chat pane. It is the tank's responsibility to make sure they aren't pulling while the healer is low on mana.
• Be polite. "Please," and "thank you," are important! Put them before and after every request. A polite party member is less likely to be kicked when they make a mistake than a rude one.
• Don't demand or nag. If you need something, ask for it once. If you think that your request got missed, it's okay to ask a second time, but no more than that.
• Don't cuss in party chat. It may not be a big deal for you, or in your house, but not everybody playing appreciates your profound obscenity. Again, a polite member is less likely to get kicked than a rude one.
• Don't be selfish. Only need things you need for your main set, and agreed upon items for your off-set. Nobody cares about your off-off-set. Do not hit need on orbs - unless you are using them to make an item for your main set, you don't actually need them any more than anyone else does. If someone asks to need an item for their off-set, let them. "Might use sometimes" should still trump "going to sell that to a vendor." Also remember that an instance is not a competitive event, it is a cooperative one. You don't win unless everyone else does.
  
• Don't quit. Unless you've agreed as a party to give up, dropping group is really rude. It sends the message that you don't value the time of others very much. If you think you will need to quit, warn or explain first. Example: "My mom hates it when I put her off. I may have to go," or "If we wipe one more time, I will not be able to afford this repair bill. I can't do this anymore."