A fella named Gerry Phillips is a very skilled "manualist". That's someone who plays songs on their hands. Here he is doing a wonderful rendition of Bruno Mars' "Uptown Funk".
What makes it even more funny visually is that he just has a dull, blank stare while doing this for FOUR MINUTES. Then barely a grin when it's over. Unlike me, who laughed all the way through like a 12 year old! I consider myself a bit of a munualist so this guy is my hero lol