I found this story online and think it deserves to be posted here 
My neighbor, a very quiet and modest old man, had a huge front yard and lots of dog owners liked to walk their dogs on it. Of course, many dogs would poop on the grass, but not that many people would scoop it up. The old man was very quiet and would never complain about it. However, his lawn was always clean and I have never seen him clean it, so it was a mystery to me – who cleans the lawn? I asked him about it, but he just smiled and said that the dogs actually clean his lawn every day, but did not want to give me the details…
Now, the mystery was even bigger, so throughout the day I would throw a glance at his front yard it to see how “the dogs scoop the poop”. One morning, I noticed that my neighbor is doing something in the front yard and had a closer look. He was pouring barbecue sauce on all dog poop!