Orcs are a gruff, warlike species of humanoid popularized in the writings of J.R.R. Tolkien. In Warcraft, a new movie based on a computer game franchise, orcs are gigantic, walking pairs of pectoral muscles attached to improbably large shoulders and tiny heads, from which spring enormous tusks, often chipped or with piercings in them. The fingers of an orc are each about the size of a human femur, which must make it very difficult to do things, like, oh, floss between those back molars, or, say, screw the top back onto a toothpaste tube. Despite these orthodontic challenges, however, orcs are very good at smashing things.