In vanilla WoW Molten Core, Baron Geddon had an ability that turned you into a "living bomb". After a while this debuff caused you to explode damaging your entire party. Apparently it also affected pets, and stayed on the pets even if pets were dismissed. Natuarally people waited for their pets to get the debuf, dismiss them, and summon them back outside the instance in some heavily populated areas. Bombing the auction house, anyone?