I was in the middle of The Lonely Wanderer quest for the Dark Brotherhood and went to the Tiber Septim Hotel. Soon as i entered I was greeted by some crazy fighting, some random tribe looking dudes who chased out the receptionist lady, and then a Priest of Order was throwing lightning about, I took him down but he seemed to keep resurrecting, I killed the guy I was there for anyway but hell knows what all the other stuff was about.

Quote UESP wiki: 'The Tiber Septim Hotel lobby's cell is the game's "safe zone" to prevent crashes/bugs if a creature, NPC, or even the player is in a cell added by a mod and the mod is removed. Any actors whose cell has disappeared will be placed in the hotel's lobby.'

Many strange things have occurred there! Here is the reference with just a tiny bit more info: http://www.uesp.net/wiki/Oblivion:The_Tiber_Septim_Hotel

Ah! Cool. fun stuff none the less.

I never knew that, boy the things you learn from a 5 year old game!