Now that this thread is all about hackers, which it has been for a while, I guess I'll post my own share here as well:
We hadn't had the chance to record all of the event, before which the three of us also appearing on the video had been growing our warts in the Nether, this feller, storpeedo2, had somehow managed to find us from below the lava and behind three layers of rock. He killed two of my friends in cold blood and seemed to be rather impervious to all sorts of damage; He was on fire due to the fire aspect -sword and later on even poisoned. He was constantly being attacked by three people with not having taken a single step. He alone broke my diamond armour before he had come trough the portal into our basement, where I had the chance to repair it, without having any of his gear broken. In the video you can see him logging in after disappearing: We found him on the map more than a thousand blocks away. tl;dr: He would be a hell of an asshole to claim not being a hacker.