I've had so many problems with my neighbours. I ask them nicely - they don't change, I complain to them directly - they get aggressive, I complain to the council - nothing has been done, I complain to their landlord/letting agent - my garden suffers mysterious damage but for a while they will behave. I think I'll have to move as I've just about had enough.
They seem to have no idea how to behave and no conception of how what they do affects others.
Today I refused to accept a parcel delivery. Yesterday I returned their cigarette butts over the fence. What can I actually do to piss them off. We currently do extra loud karaoke early the next day after they've had one of their extra late night special parties but I'm looking for more ideas.