I HAD MY FOOT ON BRAKE AND WAS PUTTING INTO REVERSE TO BACK INTO A PARKING SPACE WHEN SUDDENLY IT LURCHED FORWARD AND HIT AN ESCALADE THAT WAS PARKED ABOUT ONE FOOT IN FRONT OF ME. IT TOTALED MY CAR AND HER CAR. IT WAS SO SUDDEN I DON'T KNOW IF IT WENT INTO REVERSE OR NOT. I BELIEVE THE ONLY THING THAT STOPPED ME WAS THE IMPACT WITH SUV. THIS WAS REPORTED TO TOYOTA, I AM WAITING FOR AN INSPECTION OF VECHICLE.