For four years, the Red Bull Trolley Grand Prix has drawn the crowds and the competitors to the Auckland Domain with its heady brew of speed, creativity, dubious engineering and, ideally, low-level injury resulting from spectacular crashes. The gravity-fuelled competition is back for its fifth run on November 22 and Red Bull and Special Group have created a clever ‘interactive’ call for entries campaign to get more teams interested in competing (and, presumably, more sadists interested in watching them).