"Backstory:  http://improveverywhere.com/2011/08/22/say-something-nice/

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"For our latest mission we constructed a custom wooden lectern with a megaphone holster and an attached sign that read, "Say Something Nice." The lectern was placed in public spaces around New York and then left alone. We wanted to see what would happen if New Yorkers were given the opportunity to amplify their voices to "say something nice." This project was produced by Improv Everywhere as part of the Guggenheim Museum exhibition stillspotting nyc."

thanks jonco