If your a guy, you've seen 'em before- urinal cakes with a motto or message on them. Why do these things even exist? How can a company make money selling ads on a thing that people piss on? I mean, whatever it is you would like people to do (say, buy cars at your used car lot, or to not do drugs), they are literally pissing on your message.
Of course, there are always other types of urinal cakes: