What's the weirdest thing that's ever happened to you?

I've never had anything particularly weird. The only thing is 99% religions, where you'll have religions in a province that add up to 99% or 101%.

I also once modded the Stamford Bridge battle to extend the time limit. I won the battle, but it didn't show victory. So I decided to quit. Suddenly the end battle statistics screen came up, showing I had won. But when I got onto the next screen, it showed I'd lost.