Tesla Model S
I was on the last day of my 7-day deposit period. I was really excited about the car. So I took my friend to a local Tesla store and we went for a drive. AP [AutoPilot] was engaged. As we went up a hill, the car was NOT slowing down approaching a red light at 50 mph. The salesperson suggested that my friend not brake, letting the system do the work. It didn't. The car in front of us had come to a complete stop. The salesperson then said, "brake!" Full braking didn't stop the car in time and we rear-ended the car in front of us HARD. All airbags deployed. The car was totaled.