Wild bear attack
I’m level 17 running a stealth archer/conjuration build, and I was doing the “Missing in Action” quest to rescue Thorald Gray-Mane from Northwatch Keep.
As I was approaching the keep, I spotted a giant bear way off in the distance on the other side of the river. Naturally, I put a couple arrows into it.
The bear then decided it had somewhere very important to be.
It ran straight into Northwatch Keep and proceeded to slaughter basically everyone inside.
By the time I caught up, there were only like two archers left standing on the roof.
I just stood there watching this freaking bear single-handedly assault Northwatch Keep.
I couldn’t recreate this if I tried. Skyrim is at its absolute best when you accidentally create your own story.