Reminds me of an occasion many years ago when I was working in a posh hotel. There was a bench type seat right next to the bar and one particular regular always sat there, mainly because he could simply plonk his empty beer mug on the bar counter for a refill without having to move.
One day, another individual unaware of the significance of this particular place, sat down there. I obviously wasn't the slightest bothered, but when the 'regular' came in and saw this bod in HIS seat, I thought he was going to have a seizure - ! He went to a nearby seat and spent the next half hour scowling and muttering to himself.
Loved the sight of possessiveness in action - !