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While these weren't technically ads, Keith Haring's drawings on blank, unused ad spaces in the early 1980s were indisputably classic and great. "I saw it going down in the entrance near my apartment at the time (the F train at 6 ave and 41st street), I saw this empty black panel, and immediately I knew that I had to draw on top of this panel. It was a waiting perfect surface," Haring once explained in an interview. Think about that next time you feel clever for drawing a dick by someone's face on a movie poster.