At a local elementary school, all teachers are expected to help with "pick up duty". The goal is to keep the children safe as they exit the cars, so the teachers control the flow of kids by opening the doors and holding them until the child exits safely. Then they close the door and the parent can drive away.
One parent drives his child to school in a very expensive sports car. And each time the teacher let his child out, she was roundly criticized for slamming the door too hard.
The teacher quickly tired of the daily tirade. One day she answered, "Sir, I don't close your car door any differently than I close anyone else's door. I am sorry that your car sounds like a tin can."
She was never criticized again.