Okay, somebody who has quick easy access to Oblivion right now:
1. Go to the Wizard's Tower
2. Get on the top most floor, next to the balcony
3. Position yourself so you'll fall off if you go all ragdoll
4. Lower your fatigue to a negative level so you'll faint (I suggest eating a large amount of rat meat)
5. Tell us what happened
For those of you who are no fun. Spoiler Your body falls so slow that your person separates from it and falls to his death while his body is still floating down.