So there are some local neighborhood cats that have started hanging around my backyard and deck. Recently they have decided to start using the posts on my deck as scratching posts and they are making a mess of it. I know there have got to be some simple things people do to stop getting their own cats to stop scratching their furnature. Any ideas how I can get these cats to stay away from my yard and deck? (Besides just sitting there drinking beers and shooting them with paintballs.) *EDIT* I don't hate cats, just hate that other people's cats are making a mess of my stuff.