I was doing a yard today and a rock shot out and busted a window on a house. Luckily nobody was hurt and the window is only about $100.00. Heres the problem Im having. The rock was from one of the ziplock bags that people put their advertisements in, fill it with rocks to weigh it down and then throw it on the property. I saw it and it was to late to stop by then. I heard the rocks hit the blades, the bag and the ad came out shredded and then I saw something fly and the window shattered. I knew something bad could come from someone doing this. IMO its littering and now it can hurt something. Thoughts on this poor method of advertising?