I just picked up this 1 in Ironforge. Dunno if it is an exploit or has been posted before. But anyway the things u need is
Hallloween Candy that makes u like a big undead that says on ur buff ''You look a bit thin.
And u need Winterfall Firewater ( Get at AH, or its drops in Winterspring, i recommend AH :P )
In Ironforge, on the right side of the door to the bank, yes that area where u can duel in Ironforge.
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Sry for bad howto guide