http://improveverywhere.com/2012/07/30/the-mp3-experiment-nine/ Like us on Facebook: http://facebook.com/improv.everywhere Follow us on twitter: http://twitter.com/improvevery Subscribe on YouTube: http://bit.ly/iesub For our latest mission, over 4,000 people participated in an epic water gun battle as part of our ninth annual Mp3 Experiment event. Participants downloaded an MP3 file and pressed play simultaneously on Governors Island in New York City.