Not exactly horrible neighbor, but his housekeepers. They were his relatives who needed the money but couldn't land a job, so he paid them to clean his house. They would arrive at 5AM and start screaming at eachother from the other side of the house to keep talking the whole day +

+ And our houses were as close as apartments, so we could hear everything as if they were standing right by our side screaming and hittingthings with brooms and such. They would spend the whole day there, everyday, preventing us from getting sleep anytime they were there cleaning +