Am wearing my grey felt coat, and notice a man wearing what seems to be an identical coat. He is slightly smaller than me, with very short dark hair, and a goatee. "Excuse me, but where did you get that coat?" he asks. "Marks and Spencer", I reply, not letting on that I have noticed he is sporting the same garment. "Are you ___ ____?" he continues, using my real name, and I confirm that yes, indeed I am. He introduces himself - he's a good friend of my brother-in-law, and the son of one of my wife's clients.
This person does actually exist, though I've never met them. I'll now have to find out if they really match this description.