A reference to the vanilla quest "Consumed by Hatred." (Links to Wowpedia because Blizzard reused the original quest ID.)
The quest was a real pain in the rear. The quillboar were annoying to kill because you usually couldn't avoid aggroing more than one at a time. The quest item itself - Bristleback Quilboar Tusk - wasn't a 100% drop chance. It was not a pleasant quest to do at-level.
Yes, I'm still traumatized whenever I think about it.