I was playing the Earth 18 civs map today and the barbarian activity seemed really out of the ordinary. Each civ had about 3 cities, with those that got good starts building more settlers, when I started getting messages that AI cities were being captured by barbarians, something that I've never seen happen to the AI on other maps. I thought nothing of it - I was England so I had nothing to worry about - until I got a message that the mongolian civ had been destroyed by the barbarians. At that point I was amazed that Ghengis had been stupid enough to get destroyed like that, leaving all of Asia to the Chinese and Russians. But then just a few turns later Hatshepsut lost Cairo to the barbarians, and then the very next turn Mansa Musa went down too, leaving all of Africa to Saladin. Until he got wiped out as well. Just as I was going into the worldbuilder to try to figure out what was going on I got a message that Japan had fallen as well, and india and persia were down to just their capitals. So effectively China and Russia had all of Africa and Asia to themselves. After that I decided to just quit and start afresh. Has anything like that ever happened to you? It was pretty surreal.