I'm not sure if this counts as me sighting someone else or someone else sighting me. No picture, but:
I was getting out of my car and a guy in a car paused by my parking spot said "Nice car" with an odd grin. I said, "Oh, thanks!" and grinned. As I walked towards the credit union, I noticed him driving around the row of cars and turning towards an exit, and realized I'm an oblivious moron--he was driving a Model S, too! I waved--not sure if he saw me in his rear-view mirror or not.
I think I win oblivious owner of the year or something. . . . ;-)