A man starts laughing on a dreary and boring metro ride in Belgium and shows us that laughter is contagious and capable of spreading rapidly. The other metro passengers can’t help themselves from laughing at and with this man who apparently has no idea how he sounds. This wonderful advert from Coca Cola shows us that happiness truly does start with a smile and laughter makes everything better. If you enjoyed this you might also like to see this Funny Dad Laughing.