One time, in Civ I, I was living my best life as Rome on a big island until the Chinese sent a battleship to my shores and started destroying my triremes. Somehow, I used a diplomat to take over one of their cities and production was stuck on mobile infantry (must have been a bug), which gave me the ability to make units that could defend against their tech. Then I sent more diplomats to steal tech. The list of tech ran off the screen, but it allowed me to still select tech I couldn't see. So I started scrolling beyond the visible point and blindly stealing tech. When I accidentally stole nuclear weapons, I built one, loaded it on a trireme, and sent it to Beijing. Their empire instantly split, and I was able to survive. It's still my best memory from any Civilization game.