From my first game in CKII (a while ago):
So, I saw that the empress of Byzantium was single so I decided to marry her to see what madness would ensue
When the above emperor's 4-year old Great-Grandson inherited the empress's throne this happened:
Needless to say, I haven't touched that save in a while
Let this be a lesson for everyone: Greeks don't like to be ruled by German Kaisers. (To be fair, neither do Germans XD)
Bonus minigame: can you tell how many wars are there in the last screenshot, because I certainly couldn't XD