My in-laws sold their house a few years ago (2010, IIRC) and had problems with a neighbor across the street who wouldn't do ANYTHING to their lawn to keep it up. These folks were REALLY trashy and one day, just drove their van over and parked in my in-laws driveway without even asking and left it there! And that was just the tip of the iceberg.
Anyway, the lawn was at least a foot tall and my father-in-law went over and said "Look, I'm trying to sell my house and would appreciate it if you could help me out the next few weeks by keeping your lawn cut." He just got a blank stare and nothing was done. Finally, he literally got on his lawn mower, drove across the street, and cut the lawn himself because these morons were too lazy.
People who don't take care of their properties really piss me off. I just don't understand the logic of spending hundreds of thousands of dollars on a house just to let it fall into shambles -- tall grass, gutters falling or having plants grow in them, etc. Seeing how bad some houses are kept only makes me wonder how bad the insides of these homes must be.