Improv Everywhere, the folks behind the No Pants! Subway Rides and other bizarre pranks, presents their latest stunt: the Mp3 Experiment 6. Here’s the deal: Go to, download the roughly-45-minute instructions, transfer them to your iPod, synchronize your watch to an atomic clock on the site, and head out to Roosevelt Island. Once there, you’ll press play, along with everyone else, at the predetermined time, and do whatever hilarious activity the voice in your headphones tells you to do. Past Mp3 Experiments have included spontaneous games of freeze tag, balloon wars, and a conga line—all successfully freaking out unwitting bystanders.

Sat., May 23, 4 p.m., 2009