Ming's Motorcar Metaphor

Buy a car, pay cash but don't take delivery. Instead, let the dealer loan your car for his own profit to someone who then uses it to run you over. After the vehicle is wrecked and you suffer irreparable harm, the miscreant returns the car whenever he feels like it. This can also happen when you buy Dendreon. It can only be prevented by taking your car's registration certificate and parking the vehicle in your own garage.