‘Mad Max Beyond Thunderdome’ turns 40 this year. Despite a brutal battle in a metal cage and countless automotive fireballs, this third instalment of the Mad Max series was a point of relative calm and humanity, with threads of humour, hope and compassion, and a pack of scrappy munchkins who warm up the tone. Most significantly, the casting of Tina Turner as the post-apocalyptic leader Aunty Entity moved it into blockbuster territory. As the hinge point of the five Mad Max films, it opened up th