I saw Martin Keown in a restaurant once. A few customers spoke to him, so guessed he was someone sort of well known. We made eye contact and he gave me a half hearted smile as if waiting for me to realise who he was. Initially thought was he was an actor from The Bill (my go to theory back in the day if someone looked vaguely familiar and had been on television). It was only when someone called him by his name and mentioned something about Arsenal that it clicked who he was.