You’re probably familiar with cartoon violence in action movies. Big stacks of tires falling on bad guys, people slipping and falling in oil slicks, the hero getting shot in the shoulder, but nobody dying. Well, “The Expendables” (2010) is part of a new trend: video game violence. Amputations, decapitations, arterial sprays and lots of death. Lots. We even get to see a waterboarding. But hey, it’s all in a day’s work for Sylvester Stallone, Jason Statham and their fellow wise-cracking mercenaries, who spread American-style mayhem around the world and then head back to the tattoo parlor for a knife-throwing contest.