I have always thought that it is simply evidence that I am 'plugged in' to the Universal consciousness (or/and my Higher Consciousness that knows ALL. You know?) Sometimes the connection with someone seems more significant than with others. But even when the other person doesn't SEEM karmic or like THEY have a message I know that it IS a message for ME - a message that I am plugged and all is well on the path that I am walking.
As in dreams I like to look from the perspective of 'like attracts like'. Who is that person? What are their main character traits? Could be that those same character traits within myself need some looking at or want to be brought out into the world some more...