Improv Everywhere, the New York-based improvisation troupe which has been staging pre-planned 'missions' and pranks in public places since 2001, celebrated the 125th anniversary of New York City's beautiful and historic Brooklyn Bridge by posting 700 of its 'agents' armed with cameras for something they called 'Camera Flash Experiment'. The cameras fired their flashes off simultaneously in the same direction thus creating a short-lived but really beautiful wave of light across the bridge.
In my opinion, this is not one of Improv's best missions but as a New Yorker and someone who fell in love with the Brooklyn Bridge the minute I laid eyes on it, it's all good.
Here are some more Improv Everywhere stunts:
700 Simultaneous Camera Flashes
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Pop Art Bus Murals
Auto-Citing Word Processors
Bike Speed-Tracking Watches
Twosome Advent Calendars
All-in-One Cereal Packaging