AN ACCIDENT OCCURRED IN MY TESLA MODEL X 90D THAT WAS DUE TO THE FAULT OF THE CAR. WE HAVE OWNED THE CAR FOR 3+ YEARS. WHAT OCCURRED TODAY IN THE CAR IS SOMETHING THAT HAS NEVER HAPPENED BEFORE. THE CAR WAS FUNCTIONING PERFECTLY FINE DURING MY WHOLE 20 MINUTE COMMUTE. AS I PULLED INTO MY OFFICE'S PARKING LOT, THE CAR SEEMED FINE. HOWEVER, AS I WAS FINISHING PARKING THE CAR IN THE PARKING SPACE, THE CAR UNEXPECTEDLY STARTED ACCELERATING AT A FRIGHTENING SPEED. MORE CLEARLY PUT I WAS ALMOST DONE PARKING AND MY FOOT WAS PARTIALLY ON AND OFF THE BRAKE. WHILE MY FOOT WAS SLIGHTLY OFF THE BRAKE THE CAR ACCELERATED SO FAST THAT IT RAN OVER A CURB AND CLIMBED A GRASS SLOPE AND RAN OVER AND TORE DOWN A SMALL TREE. THE CAR ACCELERATED SO QUICKLY THAT IT RAN OVER THE TREE BEFORE I COULD EVEN REACT. AFTER THIS EXPERIENCE I NO LONGER FEEL THAT IT IS SAFE TO DRIVE A TESLA. I'M JUST HAPPY THAT THERE WEREN'T ANY PEOPLE OR CARS IN FRONT OF ME. THIS IS A MAJOR SAFETY ISSUE AND NEEDS TO BE INVESTIGATED.