Have you ever realised that once your attention has been drawn to something or someone you immediately start to see it/them everywhere?
You meet someone for the first time and realise that you have so many mutual friends or you always hang out at the same places, but have never seen each other before. After that chance meeting you tend to see them everywhere. Or you discover a new musician and suddenly their songs are playing in ever store or cafe you enter.
This is most likely the most useless post on here, but whatever. Random thought.