It could be done with one or two people. The first would get 'killed' in town, typically near a bank. He would of course lose all his belongings in his pack, including his runestone to his house and a house key 'hidden' a few pouches deep. Fuxxored? Not quite. Quickly logging in as another character, this same guy would stealth or hide in his house, and wait for the n00b train to roll in. What happened next was always humorous. A Gate would appear and 1-3 idiots would step through, trying out doors with the stolen key and runestone. They would always find the house, and as soon as 1-2 of them stepped in, they would flag Grey and be killable with no punishment. The member or two hiding would then drop a table in front of the door and close/lock it - trapping the morons inside. 5 seconds later, a couple of dead guys would get THEIR houses looted because they were stupid enough to think they could gate in and out easily emptying our place.

Good, clean, entertaining shit.

But you can only wahoo so much (well...a lot if you add up the years). Origin finally put the final nail in the UO coffin when they 'split' the world into Carebear and PvP. COS left Ultima Online shortly after.