via Improv Everywhere

When Grand Central Terminal was celebrating its 100th birthday last week, 135 people from Improv Everywhere turned up at the iconic building—the troupe was invited over by the MTA Arts for Transit organization. For their part in the day-long celebration, they stood inside of the windows in the main concourse and put on a little light show with flashlights and camera flashes. They report back, "The choreography was all delivered via a prerecorded narrator. We placed wireless speakers in the catwalks and broadcast the narration track to them simultaneously." Seems like it was much more enjoyable to experience in person, but you can check out the outcome below:

In 2008 the troupe took the station and confused passerby by freezing in place amongst hurried New Yorkers: