The MP3 Experiment Eight [Source: Improv Everywhere]
Improv Everywhere organized The MP3 Experiment Eight in New York City:
“For our latest mission, over 3,500 people downloaded an MP3 file and pressed play simultaneously. The event began at sunset in two starting points by the Hudson River. The masses converged on Nelson Rockefeller Park as twilight ended and participated in a series of synchronized activities involving flashlights, camera flashes, glow sticks, and masks. This was the 8th installment in our Mp3 Experiment series.”
They also have pictures of the event!
Official Site: Improv Everywhere