I used to work at a coffee shop frequented by an inordinate amount of methamphetamine-addicts. A pair of such unsavory types one day came in with an opened can of (I kid you not) clams, and began offering them to the shop’s patrons. These guys even made a little sign reading “Free Try Me Fresh” to advertise the treat. The men were eventually booted, and they left their sign behind. On the back of the sign was this absolute masterpiece of drug-art.