THE VEHICLE, A 2008 TOYOTA RAV 4, WAS SITTING AT A COMPLETE STOP AT A RED LIGHT WITH OPERATOR'S FOOT ON THE BRAKE WAITING FOR THE LIGHT TO CHANGE. INEXPLICABLY AND SUDDENLY THE ENGINE REVVED TO A HIGH RPM AND THE VEHICLE LURCHED FORWARD AND STRUCK THE REAR BUMPER OF THE VEHICLE IN FRONT. THE COLLISION WAS LOW SPEED AND THERE WERE NO INJURIES AND NO NOTICEABLE DAMAGE TO EITHER VEHICLE. WE IMMEDIATELY DROVE THE VEHICLE TO THE TOYOTA DEALERSHIP FOR EVALUATION. *KB