Pharrell Williams' infectious hit 'Happy' has become a world wide sensation, and when Oprah Winfrey shares clips from around the world of fans dancing to his song - the artist breaks down and weeps.

His emotional response to the love his fans show for the song makes me appreciate him that much more, and Oprah seems to 'really get it' as well.

She comments that, "I so now get why it's so infectious, because it came from such a clear space that the energy was absolutely uninterrupted by anything other than allowing it to flow from heart to heart and that's what happens when you see it."