Was Karatechop wrong to use the shirt, or just wrong past a certain point?
Someone made of stricter stuff than myself would probably say that it was wrong to use the shirt at all, but I have to admit -- I don't have it in me to condemn Karatechop's initial impulse to try it out. GM items don't officially exist for players; we know about them only because they've been data-mined, and you'd have to be a fairly frequent habitué of Warcraft fan sites to have any inkling that they're in the game at all. If I'd been in Karatechop's position, like many players I would've believed that Martin Fury was a joke when I first saw it. Who honestly expects to run across an item like that, let alone one that was mailed to a guildie's level 13 Warlock? I don't believe Karatechop was wrong to try the shirt when he had no reason to believe it was anything other than a joke or some bizarre glitch.