If you've ever ridden on one, you know that the subway can be a pretty somber place. Passengers tend to mind their own business, reading a book or playing a game on their phone while they wait to arrive at their destination. For people commuting on the subway daily, it becomes a pretty monotonous routine. That's what makes this little moment so special.
On a crowded subway car, one woman can't help but start laughing. Quickly she's reminded how contagious laughter is, and how much fun it can be to laugh with a large group of people. Laughter is one of the best ways to bring strangers together, even if it's only for three minutes before they go their separate ways.