If your goal is to teach them ethical behavior, don't bother...people that stupid will never get it. But if you're just trying to save your hunt, it doesn't hurt to ask very politely if he would mind moving just a little further down yonder. You might get an "oh sure, sorry 'bout that," but chances are he'll just get a real stupid look on his face or respond with a shrug of his shoulders. In that case just carry on. Sharing the planet with morons is frustrating, but there's nothing we can do about it. Take a deep breath and keep telling yourself...Serenity Now!