In Florence, Northern Kentucky (right by Cincinnati) is a watertower that says in big red letters "Florence 'Yall" because it originally said "Florence Mall" and some people raised a stink that they were using city money to advertise a business. A little bit of white paint, and presto!
http://www.cincinnati.com/local/florence/E160html_04292003__GNFwatertower.ART_Other.html