Here's what ImprovEverywhere did. They:
put a Carnegie Hall orchestra in the middle of New York City and placed an empty podium in front of the musicians with a sign that read, "Conduct Us." Random New Yorkers who accepted the challenge were given the opportunity to conduct this world-class orchestra. The orchestra responded to the conductors, altering their tempo and performance accordingly.
Improv Everywhere is "a New York City-based prank collective that causes scenes of chaos and joy in public places. Created in August of 2001 by Charlie Todd, the organization "has executed over 100 missions involving tens of thousands of undercover agents." Find more of their "work" on YouTube.
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