Moved house a year or so ago. We get on really well with the neighbours on one side, and it is a nice area.
The neighbours on the other side however, they've built this conservatory thing outside the back, and sit out there every night until at least 2 am talking (loudly!) and sometimes playing music. They often have guests, and I regularly get woken up to fireworks from their garden, their music, their kids playing (they never seem to go to bed) etc.
We have never really spoken to these neighbours as they are from another country and don't seem to speak much if any English. They seem nice enough people but the constant noise and being woken up most nights is getting me down.