Mark Pilkington, who is documenting for Boing Boing his strange trip through the mythic landscape of the American Southwest, picked up this useful manual at an army surplus store in Albuquerque, New Mexico. You too can master the "butt stroke." See more pages over at Mark's blog: "Civil Disturbances (1975)"
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.