I present this as it came to me. There is a link at the end if you want to know more. The links below are all Matt Harding's.
Happy People Dancing on Planet Earth
Credit: Matt Harding & Melissa Nixon
Explanation: What are these humans doing? Dancing. Many humans on Earth exhibit periods of happiness, and one method of displaying happiness is dancing. Happiness and dancing transcend political boundaries and occur in practically every human society. Above, Matt Harding traveled through many nations on Earth, started dancing, and filmed the result. The video is perhaps a dramatic example that humans from all over planet Earth feel a common bond as part of a single species. Happiness is frequently contagious -- few people are able to watch the above video without smiling.
Where the Hell is Matt? (2008) from Matthew Harding on Vimeo.