Rain, yes rain has some sort of power to bring old memories back.  Seeing the rain drops falling down on your window, your mind wonders to those long forgotten places in your past, places you've been, people that somehow made an impact on you. But not all memories are good, not all memories are joyful ones, some are sad, some you wish you never remember. Then the tears come, because remembering can hurt. It can hurt down deeply in your heart and you just wish you'll forget again.