Monty. He was the one that almost cost me a space race victory in one of my early games. I was happily building the last part of the space ship, with an army right out of Stargate: humans (me) vs goa'uld (him). Then Monty declares war on me. At that time I didn't know about Monty's preference for weak, tasty victims, but the fact that I've already been in war with him AND razed a couple of his cities should have given me a clue, right?
Well, needless to say my building time was getting longer instead of shorter when Monty started to bomb the mines and occupy the tiles outside my city. I brought almost all that I had in there, lost a couple of cities (archer vs gunship doesn't seem to do a very good job somehow) but I still managed to finish it.
These days, Monty's going down first if he shows his ugly head near enough.
Oh, and to keep in touch with the thread: YOU GOT NUKED?!?
P.S. I wanted to experiment once and disabled the "easy" wins - Domination and Space Race. I ended up with a cultural win after almost everybody finished the tech tree around 1800. Didn't have the mood to go for conquest, diplomacy wasn't an option. Boy, was that boring or was that boring.
Then again, I'm a tech trader that could put Mansa Musa to shame, so in my games almost everybody's well ahead in techs compared to the "normal" development.