I was in the Sultan Center last century (or possibly the one before!) and I saw someone coming towards me and I recognized him. I couldn't remember who he was, but I had to say hello to be polite. He said hello politely, and we passed on without further conversation.
When I got home, I turned on the television (being a media addict). I passed through Kuwait Channel 2, and saw the 'acquaintance' I had just greeted. I 'knew' him as a KTV announcer! Yumma!