Colm-kun
Lokir. The Horsethief.
I broke the game legitimately once. When you're first running from Alduin in Helgen, when you enter the tower from the chopping block, sprint your fat a** up the stairs on the rubble passed where Alduin busts in and blazes ********. I lol'd because he got stuck there until I entered the keep. Oh and I also got Fireball without having to learn it. May have been a different glitch though.
The game is incredibly glitchy. I remember once I was fighting a bunch of Draugr who could use the Fus Roh Dah shout. After getting launched into the air once I was launched again by another shout. I ended up falling into somewhere it's impossible to get out of.
Oh and there's a method of falling under the map. I did it illegitimately but I'm sure it could be reproduced legitimately. You just need to chuck piles and piles of loot around in a small area. It seems your character will trip over them and fall outside of reality if done correctly.
Oh and yesterday I was fighting a dragon and it flew through a wall. It annoys me that dragons can, if they choose, ignore solid walls.
On the note of it being a glitchy game I think
this video shows it pretty well.