Outside a grim hangar on the outskirts of Arnhem, in Holland, God-fearing Calvinists are handing out leaflets to ravers. They're on a mission to save young souls. Inside, it's a hellzone of sound and fury, a Hieronymus Bosch horrorscape of grimacing faces and neomedieval grotesquerie. Every other T-shirt is emblazoned with imagery celebrating death, destruction, and the dark side.