Sweep
Journeyman Pro
The best one I ever witnessed was sitting in a queue of traffic. A kid in the back seat of a car 3 or 4 cars in front of me, threw some litter out of the window. The mother driving could not have failed to see it. The guy in the car immediately behind them jumped out his car, picked up the litter and threw it back into the car it had come from. He said something to the mother about teaching her kids not to litter and walked back to his car. Brilliant. You could see the mother scolding the kid to save her own blushes.