What Annoys You Most About Your Neigbors? [POLL]

I read a study this morning that said messy yards are people's number one complaint about their neigbors. I am not sure if this is true because I have had some great neigbors who kept a messy yard. I think my number one compalint would be my neigbors not picking up after their dog. I have also had neighbors in the past that would always be snooping around my house when I wasn't home. This was extremly annoying.