Not a movie, but it really traumatized me to the point I still see it today. When I was 5 or 6 I saw some PSA during children's programming to get people to buckle up their children in a car. Some guy was driving, with his daughter in the back. She was showing him how she had learned to play a song on the recorder (the flute). Then he had to brake and I still see the flute rammed down her throat to this day. It was effective, though, as I am known to tell my kids to not run or play with something in their mouth.