There are no 'unknown unknowns' in a gaming environment
Tom, meet Leeroy: http://www.spike.com/video/world-of-warcraft/2671154
Tom, meet Leeroy: http://www.spike.com/video/world-of-warcraft/2671154
An 'unknown unknown' is something neither known nor anticipated. For example, if you succeeded in the quest, your real-world bank account would be dinged for $1000, all experience points and loot would be given to a different guild at random and one of the team would be permanently banned from WoW because they were wearing something yellow.