I was approached on the road one night by a guy walking in my opposite direction. He was with his group of friends.
"Hello, how are you? Nice to see you!" he said cheerfully.
I couldn't recognise him but I smiled back out of politeness.
Later, I realise that I had gone to his massage shop. I had gotten a massage from his friend and he was there at same time. I didn't remember him but he remembered me!