We have very good neighbors compared to others in this thread so far. But the most annoying thing about our next door neighbors is that they let their little spaniel out randomly into the street to go to the bathroom. We live on a court, so it's not really a high volume area... but still. I've come back really late at night to have to kind of slam on the brakes a bit because the dog is wandering around outside and I'm afraid she'll dart out in front of the car. Also, letting her wander around means she can crap in other people's yards and it won't get picked up, so there's that.