This is probly common knowledge, but with a rogue you can pull the mob you're killing, over to a person of the opposite faction (could do this with someone you dont like) and drop the mob on them using vanish. Posting for those who dont realize this.
ps, this could possibly be used on a pvp server for easy gankage, attack mob, make other faction get close, vanish, mob aggros to other player, you gank player. honor plus loot