There is no such thing as a magical bag that deploys to catch broken parts under the car! lol This thread is just crazy.
Are far as the driveshaft exploding, I am sure that is an exaggeration at best. Some later model E9x cars have a recall for the front driveshaft bolts coming loose. But being you are in California, I doubt that your car is Xdrive and that wouldnt apply to your vehicle.