Okay, so I haven't been on this site in a while, but recently I have gotten tired of the people in trade chat that spam "Plz run me thro RFC will pay 50 silvr!" or other things along those lines, so I found a simple, and common sense way to get back at them.
This will work with any class that can drop aggro, for instance, a pally bubbling, a mage using ice block, or a rogue using vanish.
Simply invite the noob, telling them that you'll give them a free run. Meet up with them at the instance and tell them to wait for you to grab a whole pack of mobs. Once you run through aggroing as much as you can, tell the noob that you are running back so they will get full exp when you kill them (Most noobs don't know that you can kill the mobs ANYWHERE in the instance and they will stil get loot + exp).
Simply run back, and when they are right next to you, just drop aggro, in my case, bubble.
All of the mobs stop attacking you and go after the noob, this is especially funny when you have a good 50+ mobs rounded up, or the noob figures out whats going on and tries to make a run for it, but doesn't make it.
Sit back and watch the noob die in less than a second.
*Most of the time, you can apologize to the noob and say you 'accidentally' pressed the wrong button, and you can do this whole process over again.
I tend to do this when I'm bored or just tired of hearing the beggars in trade chat.
Have fun!