(Don Martin was, of course, one of Mad Magazine's most popular cartoonists.)

Martin, who was a member of both the National Cartoonists Society and The Graphic Artists Guild (GAG),[13] was regarded as a quiet man who enjoyed relaxing on the beach near his home in Miami, where he liked slipping into the backgrounds of photographs tourists would take of each other, so when their films were developed they would wonder who the strange man was. Fellow Mad contributor Sergio Aragonés had the same impish habit.

http://en.wikipedia.org/wiki/Don_Marti…

DON MARTIN WAS THE ORIGINAL PHOTOBOMBER!

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