So I searched and couldn't find a repost of this so i think it's fresh.
The The Crucible of Carnage: The Earl of Evisceration! - Quest - World of Warcraft quest at Crucible of carnage is currently bugged. Because people bum**** that place to kill the mobs, if you are standing nearby and get the quest to kill the earl, for some reason, this quest is offered even before the bloodeye bruiser is dead. If you quickly accept the Earl kill quest before the other group kills the Bloodeye bruiser then the game will think you killed the earl and instantly give you credit. Enjoy your 104k exp.
This may work for the 2nd and 3rd quests but I only noticed it with the 4th.