It's a very simple memory, nothing special. He wasn't doing anything or saying anything. It wasn't any occasion in particular, now or then. There was nothing to it. It must have been just something in the lighting, angle, colours, the way he had his hair, the way he was sitting or something else... I don't know what...
But it took me back all of a sudden and it was really spooky cool, very déjà-vu-like. =)