While driving, the passenger front headrest suddenly popped forward hitting the passenger in the back of the head aggressively and unexpectedly. No accident involved or any aggressive braking. The vehicle/headrest is available for inspection upon request. The safety of my passenger was put at risk as it punched them in the back of the head. It gave her an instant headache and mildly upset stomach. I have not taken the vehicle to the dealership yet, planning to try and go this week. The headrest has not been inspected by anyone besides me yet. No error messages or lights before or since the event.