There seems to be a bug with the adult form of the huge dinosaur elite,Kroshik. He has 118mil hp and patrols Ihgaluk Crag.
Basically, whenever he is aggrod he never stops attacking until his target dies - he'll follow them constantly, despite range. He also has several other strange bugs - including a period where he'll stand over his last target's corpse for a while after they die - often re-aggroing after they ress (much fun kited to Violet Rise ;-) ). And most fun of all.... He'll aggro other players not in Saurok form, who you kite him by - then queue them up in his aggro list and go after them when you die (or if you can somehow break or reduce your threat).
Not too much use, but very much fun ^_^