I called BS on my roommate a few months ago for a similar story. "swerved to miss a deer" then did a 360 on the road and ended up in the ditch about 100 feet away. From a guy that's been in a hell of a lot of crashes (no autographs, please) if he were travlleing the speed he claimed to be (35mph) there's no way he could throw spin himself and end up off the road 100 feet away. He had to be travelling at LEAST 50 mph, which I'd assume is a similar case to the OP.
All-in-all glad the driver and passenger are ok. Could have been much worse. Probably wont have many girls riding in your car over the next 12 months. lol.
'91 M42 E30 - All sorts of goodies.