We have all grown up hearing that laughter is the best medicine. This man on the train starts laughing for some random reason and soon everyone is influenced by his contagious laugh. Towards the end, every single person in the train is giggling away to glory. What happens at the end of the journey is a very heartwarming. An elderly lady comes to this man, hugs him and thanks him for making them laugh. Go ahead and watch this video and a smile on your face too is a guarantee.