So all you have to do is get your family, stand in a straight line, and walk up and down over the lawn picking up any stones that you find. Like they do on aircraft carriers.

Fun for all the family, of course the neighbors think you're a little weird.

Yes, my neighbor installed a cute post fence so the previous tenant would not drive his truck over his lawn. The fence has a gravel base. I get rocks on my lawn across a two car wide driveway. They sometimes manage to fling from under my lawnmower at crazy speed aiming at cars and people randomly. It happens so rarely you get to let your guard go and then BAM.