The borders between neighboring houses are not always quite distinct. They are carved out in the summertime based on where people move the grass. Or don't mow the grass. There's a mailbox that is overgrown with long grass because it is technically aligned with the left hand house but it is the mailbox of the right hand house. And don't even get me started on what happens when an outside service cuts the grass. Sometimes the reinforce the dispute. Other times they ignore it.