Life is a movie, and everyone likes to think of themselves as the protagonist of their own story. Every person in it, plays their own role. Even your neighbour, your mailman, or even a stranger you smile at, end up becoming a part of it.
You are a part of millions of such stories. Every moment you spend with someone becomes a permanent part of their life. It's upto them to hold on to the memory of the time they spent with you or to let it go. But it's upto you, to leave such an impact and make every memory of yours worth cherishing. People may end up remembering even the smallest moments they had spent with you. And at the most random time of their lives, maybe after years, something you had said or done may remind them of you and the time spent with you, even if it is just for a fleeting second.  And if they do think of you, I hope it is because you made their story better and I hope that it puts a smile on their face. It's scary how we end up impacting so many lives without even knowing it. We can either make/break someone's day. Not everyone values the same things as we do. Not everyone thinks the same. If we remember to always be kind and realise how deeply our actions may affect others, we can end up brightening small parts of millions of stories :)