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Ok before I start I did not make this trick up myself I found a youtube vid on it like 8 months ago.
You have to be a Hunter or Warlock to be able to do this. First find Emeriss the world dragon boss. He spawns at one of these locations:
Duskwood
Ashenvale
Hinterlands
Ferelas
After you find him send your pet to attack him or if your a hunter use eyes of the beast to make things easier. After you attack him send your pet back and eventually he will put a debuff on your pet called Volatile Infectionm it does around 1k dmg to anyone next to your pet every 3 seconds. Right after he puts the debuff on your pet dismiss your pet and go to org AH and wtfpwn anyone. You will need a healer though for your pet so it doesnt die. The Volatile Infection lasts 2 mins.
Vid:
[YT]rqQ1n01SDm8[/YT]
edit: can also be used to kill people in duels after they lose : D