When HBO Max launched back in May, WarnerMedia's new streaming service came with a magical surprise: All eight Harry Potter films were available, despite the report one day earlier that a streaming deal couldn't be struck. What surprising and fun news that was! Anyway, all the Harry Potter films will be leaving the service in August. The Wizarding World franchise isn't the only big title heading out the HBO Max door. Both Kill Bill films are leaving August 31, as will John Wick: Chapter 3 - Parabellum, Dumb and Dumber, Magic Mike, Full Metal Jacket, and Pee-wee'…