i live in a small block of flats, and im always up at the window when somebody drives in or i hear people talking, but thats more to do with me being para about the car, not actually watching anyone in particular.
The girl next door is HOT, so a quick look out the window to the sound of heels walking by is a must
Also, we park in a residents car park, so anytime a loud exhaust is heard, another look out the window
Apart from that, rest of the neighbours are old, keep themselves to themselves, and look out for us as we do them. They must be ok, I used to have race cars in the back yard, up to 5 of them at one point cos I used to prep them, all having to be started every now and then - noisy, and neighbours ok with it
Soap Operas are based on this bit of human nature. In fact Cinema, theatre , novels pavement cafes etc etc. One of the reasons for going to the pub and paying £2-50 for a pint when you can get one for 99p at the supermarket is to enjoy the pageant of life.