If you buy a ticket purely to experience the action scenes of Boy Kills World, you might get your money's worth. They're spread out at irregular intervals, but they're usually a treat. One of them even features Yayan Ruhian, aka Mad Dog from The Raid, one of the defining action movies of the 21st century. This buys the film — which stars IT's Bill Skarsgård and boasts horror legend Sam Raimi as a producer — some fleeting credibility, if nothing more. Yet there's no getting around the fact that Boy Kills World can be a difficult watch.