AT THE TOP OF OUR DRIVEWAY JUST OUTSIDE THE GARAGE DOOR, MY WIFE PUT OUR 07' LEXUS ES350 IN GEAR AND SECONDS LATER THE VEHICLE BEGAN TO ACCELERATE WILDLY. SHE WAS UNABLE TO SLOW THE CAR'S WILD ACCELERATION DOWN THE DRIVEWAY AND CAUGHT PART OF A RETAINING WALL ON THE PROPERTY WHICH FLIPPED THE VEHICLE ON IT'S SIDE. I WAS INSIDE THE HOUSE AT THE TIME BUT HEARD THE CAR'S ENGINE REV JUST BEFORE THE CRASH. THE ACCIDENT APPEARS TO HAVE INITIATED BY SOME EXTREMELY DANGEROUS MECHANICAL FAILURE THAT ALLOWED THE ENGINE TO REV UNCONTROLLABLY . OUR INSURANCE COMPANY WILL SOON BE TOWING THE LEXUS TO THEIR FACILITY. I NOTIFIED A CLAIMS AGENT THAT THE ACCIDENT SHOULD BE BROUGHT TO THE ATTENTION OF NHTSA HOWEVER, THE AGENT WAS NOT AWARE OF HOW TO COORDINATE THE EFFORT SO I AM PROCEEDING FORWARD MYSELF ASAP. THE CAR IS OBVIOUSLY TOTALED AND I'M NOT SURE WHAT INSURANCE WILL DO WITH THE VEHICLE.