New York-based Improv Everywhere, has a simple mission - To cause scenes of joy and chaos in public places. To accomplish it, they perform fun events all over New York and other parts of the country.

One of their most popular ones is the MP3 Experiments an annual event held in June. People who wish to participate are required to download an original MP3 file from Improv Everywhere's website and synchronize their watches. Then, on a pre-determined date, they all get together at a specified public location.

At the stipulated time, they switch on their MP3 players and follow the hilarious instructions that follow. Started in New York, six years ago, the MP3 Experiment has become so popular that they are now held in Toronto, San Francisco and Chicago. We have a feeling the tour will be extended to many other locations soon!

source:improveverywhere.com