I WAS SITTING IN THE PASSENGER SEAT OF THE CAR WHILE IT WAS PARALLEL PARKED. I PRESSED THE PUSH TO START BUTTON TO TURN ON THE BATTERY SO I COULD CHARGE MY PHONE. THERE WAS NO ONE IN THE DRIVER SEAT. THE CAR TURNED COMPLETELY ON WHEN I REACHED OVER TO PRESS THE BUTTON. NOT ONLY DID THE ENGINE START, BUT WITHOUT ANYONE PRESSING ON THE BREAKS THE CAR RELEASED ITSELF FROM BEING PARKED. THE CAR STARTED ROLLING BACKWARDS INTO THE CAR PARKED BEHIND ME. I HAVE NO EXPLANATION ABOUT HOW THIS HAPPENED. I HAVE BEEN READING INTO IT AND APPARENTLY IT'S A DEFECT OF THE 2015 AND OLDER MODELS. WHEN THE CAR STARTED ROLLING BACK I ALSO STARTED PRESSING BOTH THE PARK AND PUSH TO START BUTTONS TO TURN IT OFF AGAIN. I'VE NEVER FELT SO UNSAFE IN A VEHICLE AND GOES TO CONFIRM THAT PARK AND PUSH TO START SHOULD NOT BE BUTTONS!!! IT MAKES THE VEHICLE MUCH MORE DANGEROUS NOT BEING ABLE TO OVERRIDE THOSE COMMANDS WHEN IT CHOOSES TO GO ON ITS OWN.