You don’t see him approach the cow farm, but when an unsuspecting man closes the trunk of his car, there he is. Filmed from below, he is a massive wall of muscle and coiled anger. We’re just as surprised to see the beefy man as the other guy is, so his deliberate threat is all the more menacing. This is the bravura opening toMichael R. Roskam’s Bullhead. A startling thriller, the movie centers on Jacky, the muscular man played by Matthias Schoenaerts, and the world of illegal, hormone-driven cow farming.