It can happen to any of us at any moment. We went somewhere, parked the car, did whatever we went to do and came back to find it's not there. Then comes the panic.
Was it stolen? Was it used as a getaway car on a daring bank heist? Maybe some aliens came from Alpha Centauri all the way to Florida and chose your car, of all things, to study our technology. Maybe Superman used it as a blunt object to smack a supervillain in the face.