Well...the first time me and 3 friends had a Lan Party, one of them just got hold of Oblivion, and we all installed it, the Lan party turned into us all playing Oblivion all weekend, essentially racing each other.
I remember Chris went all stealthy, and was doing the assassin quests, I on the other hand had a Kahjit (the cat people?), and went off to the imperial city, murdered a few guards took all thier armor, made a warrior character and went off to the the assassin quests, blundering through them like solomon grundy, without having to worry about being killed, much to my stealthy friends dismay.
Then I think I fist fought my way through the arena....ahh unmodded Oblivion, how I do not miss you.