I was working in a first aid post at a certain large carnival which was recently held in London. A guy in his early twenties came in with blood down his face and all over his clothes after he had tried to stop someone in the crowd from running off with a woman's handbag. He knew with hindsight that it was a bad idea but at the heat of the moment he acted on an instinct and received a punch in the face for his trouble. At least we were able to make the rest of his day slightly better - we cleaned him up and one of the doctors (yes, a real doctor) came over within 15 minutes to examine and close his wound, saving him several hours wait in A&E as a result of a split-second's decision to stick up for someone more vulnerable than himself...what a lousy end to the day that would have been.