this one pissed a lot of people off, though i thought it was clever.

http://gothamist.com/2007/08/16/hangups_about_s.php

It's a good example of a different type of offensiveness. There is a definite difference between the offensiveness of a tasteless joke and something that strongly goes against our inbuilt desire to protect children. Also, it hanger ad seems inherently less dumb in that it was designed to generate controversy, because (most) attention is good attention. There is nothing good about the PR generated by the censorship company because there is nothing controversial about it; everyone thinks it is a bad idea.