M2TW is the only one I have, but I love it. Too many weird things have happened to list or even remember them all.
To name a few: I once invaded Hungary as the Turks in the late game. A big field battle began, and my army's first shot, a cannon ball, hit and killed the Hungarian general instantly.
I also noted that Portugal and Spain seem to view Ireland and Wales as some kind of holy land; they always, without fail, landed a small stack led by either their king or their heir to attack Caernarvon or Dublin.
And in one game as Spain, the Scottish and English were always at war. For some reason they always loaded up their armies onto ships, sailed to my northern coast, disembarked, fought, and went back home to repeat the cycle. Maybe they liked Spain's weather more. In any case, the Scottish eventually won, took over the British Isles, and invaded my northern coast by sea. My pike and shot armies annihilated them and proceeded to conquer their entire empire in short order, but still. What the hell, Britons?