DRIVER STARTED TRUCK ,PUT IT IN REVERSE AND EXPERIENCED UNINTENDED ACCELERATION. WITNESSES OBSERVED REAR TIRES SPINNING, HEARD ENGINE REVVING UP AND DOWN AND BRAKE LIGHTS ON. TRUCK STRUCK A STONE WALL, BOUNCED OFF AND CONTINUED TO ACCELERATE UNTIL IT HIT ANOTHER PARKED CAR, DESTROYING BOTH VEHICLES. DRIVER TRANSPORTED TO A LOCAL HOSPITAL. INCIDENT OCCURRED AT THE CITY HALL IN MIDDLESBORO, KENTUCKY. REPORT TAKEN BY THE MIDDLESBORO POLICE DEPARTMENT.