I was just thinking to myself earlier about a possibility for a boss in World of Warcraft to be so hard, that would require 100% perfect coordination from every single player, that it would be nearly impossible. I doubt such a thing would ever exist, because even the most minute latency hit could screw it up.
Then my thoughts drifted to a question; what is the hardest boss of any video game ever created? Granted, I haven't played every game out there, so what my idea of hard could be extremely easy compared to some. I'm just a bit curious as to what a truly hard boss could consist of.
In your experiences, what is the hardest boss in the world of video gaming?