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While doing some quests in Dustwallow Marsh, I noticed on one quest where you have to click on the Ogre Bones to release an Ogre Spirit, whatever aggros the Ogre first, is used in his message. In this case, my Searing Totem shot a fireball when he spawned, and thus pulled aggro.

The harpies in the Barrens do this as well at times. Not really a glitch, but, it is amusing.