Do human billboards really work? You know you’ve seen them. From the high school kid doing tricks with a big arrow sign to a guy walking around handing out flyers with a billboard strapped to his chest. And then you have the random immigrant holding a sign advertising a bar or deli or something like that. In New York these signs blend into the background of crowded streets. I look at the same sign every day and have never felt the urge to grab a drink at Annie Moore’s.