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Could it be The Greatest Rock-n-roll Photo Ever Taken?

The shot, taken in a 1969 Cash concert at San Quentin after a photographer asked Cash for a shot "for the warden".

The pic resurfaced in 1998 when Cash took out a full-page ad in Billboard. Disappointed at the industry's reluctance to play his newer music, the photo appeared with the following cation placed squarely above Cash's middle finger: "American Recordings and Johnny Cash would like to acknowledge the Nashville music establishment and country radio for your support."

Johnny Cash may be in the Country section at Best Buy, but deep down he was all rock-n-roll, baby...