Joaquin Phoenix and Shooter Jennings visited California's Folsom State Prison on Tuesday (Jan. 3) for a brief acoustic concert and a screening of the Johnny Cash biopic, Walk the Line. More than 50 inmates watched the movie, according to The Associated Press. Cash recorded his landmark album Live at Folsom Prison there on Jan. 13, 1968. Phoenix stars as Cash in the movie. Jennings plays the role of his father, Waylon Jennings.