The contact owns a 2021 Tesla Model Y. The contact stated on two separate occasions while idled in a parked position and the brake pedal depressed, he shifted into reverse position and the vehicle inadvertently lunged forward approximately 5ft without acceleration. The vehicle then performed as normal. The contact then stated that on a separate occasion while idled in a parked position and the brake pedal depressed, he shifted into drive without the accelerator pedal depressed and the vehicle lunged forward 15 ft without warning. As a result, the contact crashed into a restaurant window. No warning lights was illuminated. No medical attention was required. A police report was filed. The vehicle was currently being towed to the dealer. The vehicle was not diagnosed. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 15,000.