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I got this via Digg this morning. Dugg.

This poster was released in the mid 80s and prompted a total recall of all posters because of the picture painted in ice-cubes at bottom right corner - a woman performing an act. The graphic artist who designed the picture put this in as a joke, and it went through unnoticed until someone spotted it on the back of a Coke truck. The artist lost his job and was sued, and all promotional material had to be recalled and destroyed. Very rare and hard to get hold of — released in South Australia in mid '80s.

Original post here at Snopes