A while back the woman that lived across the street from me was having an affair with a cop, and his car was parked on the street at odd times of the day and night. I LOVED it! All of a sudden everyone was on their best behavior, driving slowly down the street, keeping the noise down at parties, etc.
On my TV street there is this one couple that peeks out the blinds at anything and everything. They aren't very social, but they sure are interested. As a matter of fact, while we were gone two of my friends drove over to our house in their golf cart, got out and walked around and peeked in the windows because they hadn't see the house yet. My neighbor came over and stood at the edge of the yard, obviously watching them. He never introduced himself or said anything, just stood there. There isn't anything suspicious going down on my street without those two keeping watch and being able to make a full report. Maybe every street needs that one nosy neighbor.