We were doing Karazhan at 70, with a melee heavy group. We got Prince down to less than 2% and all was comfy so we decided to de-equip our weapons and punch him to death.
It was funny for about 20 secs but then the tank accidentally died. Some people wanted to switch back to weapons but others wanted to maintain the punching. There was arguing on vent and things became flustered. Some of those that wanted to reequip their weapons couldn't because of the nasty things that were being said, they were fumbling on the keys. When someone said they couldn't find their weapons in their bags one of the healers immediately gquitted. Because this healer was an attractive women two other guys immediately gquitted.
Prince did actually die when the warlock and healers managed to range him down but the guild wasn't the same again. By which I mean it disbanded.
Just goes to show you can't be too careful.