I'm always amazed how our mind works. 

You can see someone you haven't met with in a long time and all the memories and feelings you had with that person fly in and it feels like you are in those moments again.

Maybe it's a scent, an image or even a deja vu and we are transported to a time and place that feels familiar. Unfortunatley it can also take you back to a place that's painful. (I've had a few of those)

It's like time has no relevance, our mind relives moments that are meaningful. Pay attention...