The artist Jay Shells is at again with a series of street signs that look almost real from the Metropolitan Etiquette Authority. The signs, which aren't officially sanctioned of course, ask you to watch where you are walking while Facebooking, pull your pants up, and other banes of urbanity. Shells bolts the signs to street poles around New York City, sometimes even in front of policemen, and has been interviewed on several talk shows explaining his "art." Sponsor I am a big fan of etiquette scams.