On July 16, New York's Rockefeller Park was lit up like a Christmas tree when over 3,500 people converged for Improv Everywhere's latest MP3 Experiment. The popular series of "missions," as IE calls its stunts, asks participants to download an MP3 file, gather in one spot, hit play at the same time and follow the audio instructions for an awesome effect.

The eighth installment in the MP3 mission series included activities with flashlights and glowsticks, giving the phrase "flash mob" an entirely new meaning. Check out video of the mission below:

[Improv Everywhere via Laughing Squid]