Double Message: Do not litter, We are the best

I am not really sure if this a real ad, because place in a bill... however, conceptually, i think is brilliant. They have put two ideas into one ad, one stronger than the other one, but still effective. The fact that they are a beer company and they have nothing to do with littering issues attracts your attention. But then the use of the pun "liter", i believe is just intelligent. As I mentioned before, i don't know about the display of the message, but i dont think it needs an image to be effective.