I live on a corner lot, and people walk through my yard all the time.  I don't think I'm your typical cranky old man, but a lot of people really push my boundaries. I don't get upset when people step into the yard when a car is coming or something, but some people are walking 10+ feet into my yard like it's a sidewalk, they get close enough that they can easily see into the windows.  I occasionally find dog poop in my yard as well. 