keep it down man.. i've had this too soooo many times over the years...
to be honest i've learnt the hard way, but you need to keep on goood terms with your neighbours. always going round and telling them if you're gonna have it loud. also, set levels with them.. and NEVER go above those levels. i don't care if you come in pi**ed as a mofo, get smoked up and think sod it - you MUST NOT GO OVER THAT LEVEL!!!