Seems like everyplace I live, I always have nontraditional arrangements with my neighbors. Our neighbor's Great Dane has probably spent more time in our house than his own over the past 7 years -- many people think he's ours and we keep a separate leash, bowl, and treats for him. We have a hole in the fence so he can come anytime he wants, and he has learned how to open our sliding glass door. Another neighbor weeds my front berm free of charge and even has planted things there.
At the last place I lived, I mowed the lawn of a perfectly able bodied neighbor who was just about my same age as me free of charge just because I felt like it.
Anyone else do strange things for their neighbors or vice versa?