We all know we get emotionally involved in the game, and take Civ AI's actions personally. So I'd love to hear what is the most flippant thing you've had an AI do that caused you to decide to wipe them off the map in direct response to this action. I was playing a game earlier today and the Egyptians decided to build a city right in between my two cities - well away from anything else he had built. Right there and then I decided I was going to wipe him out (ok, I won by domination, so technically I wiped everyone out, but I wiped him out first because of this stupid city he built). So first I connected my two city's territories and made sure that he could not get to his own units in peace time. Then I built up an army, and, after having this Egyptian ponce whine at me for building near his empire, I proceeded to demolish him. I made sure to raze that offensive blot on the landscape when I defeated him (I left it for last).