I also heard that the random event coding is actually used. Like I can't find out the website I read it on, and I have asked others to try to find it, but I read that it is coding for an alien invasion (of sorts). It was pretty detailed but I don't know the site so I will try to tell you everything it said. There is something around a 1/million chance that 5-10 GDR (per-civ in game, and depending on the era it starts) will drop around the largest city of every civ excluding the capital and take it. They get a bonus to production, and can see the entire map always, including all submarines. It will add an "alien" civilization that you cannot contact, and cannot make peace with. All civilizations at war get a 10 turn peace treaty, but afterwards can still fight eachother (if the AI are stupid enough to do that o.o.. so they will)
I personally think that website was full of crap, but there is something to ponder about
I will be making an alien-invasion scenario soon if anyone is interested