Were you sitting here?
I thought of this incident recently when Joann and I were walking thru town and decided to sit on one of the benches at the town dock. I noticed the look of a couple of ladies near us knitting and talking. It was the same look that I had gotten in the bus a few years ago. I quickly suggested that we move to another nearby bench and with in minutes several ladies, knitting in hand settled into our vacant bench. It was "their bench " public as it is but non the less a place that I would bet they use regularly to meet and discuss knitting and events of the day with friends.
I guess it is one of those unspoken rules that you don't violate. Like going into a local VFW post and taking "Norms" seat at the end of the bar even if the World War II vet had not been in for a beer in years. It was still his stool.
There are certain rules of life that make things go more smoothly. They arent written down, nor should they be but if we would listen to them once in a while life would be a bit easier for all of us.