What would it be like if all of a sudden everyone in a public space were "muted”? This is what the New York City based prank collective Improv Everywhere did on their recent mission set in Prospect Park in Brooklyn last month. What would it be like if all of a sudden everyone in a public space were "muted”? This is what the New York City based prank collective Improv Everywhere did on their recent mission set in Prospect Park in Brooklyn last month.