https://www.youtube.com/watch?v=x5fAfsh_LGohttps://www.youtube.com/watch?v=LgV0oBKb8BYthe first one seemed spontaneous and went viral, the second is clearly scripted attempting to keep the wave going
https://media.giphy.com/media/3oEduNVDH8VSJkCiWY/giphy.gif