Collectors Weekly looks back at Johnny Cash’s famous performances in Folsom and San Quentin, as photographed by legendary music photographer Jim Marshall:

The most famous image from the day, though, is unquestionably the candid shot of Cash taken during a rehearsal before the show. […] Marshall recalls the origins of what he believed was “probably the most ripped off photograph in the history of the world. […] I said ‘John, let’s do a shot for the warden.’” Apparently, that’s all the prompting Cash needed to look straight into Marshall’s lens and flip him the bird.