Some years ago, as I was passing two students walking on the pavement in the same direction that I was travelling, I had to drive close to the kerb to pass a stationary car that was waiting to turn right.
Apparently, the student nearest the kerb was thumbing a lift when he heard a car approaching from behind, by putting out his arm with his thumb pointing upwards. He did this just as I was about to pass them. My windscreen pillar, which had a chrome drain channel, struck his hand.
By the time I had stopped and got out of the car, his hand had swollen to twice its normal thickness, and he was clutching it to his chest. I pointed out that it was his fault, but offered to take him and his friend to the local A&E. His friend said he should go, but he flatly refused the offer. I asked for his details and if he wanted mine. Again he said "no", and, after trying a few more times, I had no option to continue my journey.
During this time I told my wife (who was my passenger) that he would be in severe pain the next morning. Considering the possibility that his friend had noted down my registration, I decided to visit the local police station, report the incident, and have it logged.
They were totally disinterested, and my insistence developed the situation into an argument, which was only resolved when a senior officer came onto the scene, and told the desk sergeant to log it to "shut me up".
But if I had not acted in this way, and the student later reported me, I bet I would have been prosecuted for withholding my details.