Earth 18 civs map. I played as America, wiped Monty out early and spread across the western hemisphere at the speed of fast. I then spent the next several centuries, till the modern age, colonizing Australia, south Africa, and bulking up my economy.
I then decided that France, who had taken out Spain, Germany, and Rome was getting a little too big for my tastes. England was good enough to give me their island and I prepared for my own version of Normandy. Several Tactical Nukes later Paris is unguarded and I'm ready to walk in. All was going well generally.
And then came the epic fail, my 55+ unit stack storms ashore and the tiny, little, totally unimportant detail that SDI only stops nukes in my territory leads to well... no more unit stack in one turn.