One of the great cinematic mysteries is how Jared Hess’s deadpan Napoleon Dynamite—the story of a stringy Idaho mouth-breather with eyes perpetually at half-mast—became a teen anthem of sorts. In Nacho Libre, Hess has a truly dynamic protagonist: Jack Black as a novice Mexican friar turned masked wrestler. Deadpan does wonders for the sometimes wearyingly extroverted Black, especially when it’s broken up by ejaculations of Jack Blackness. The movie is semi-infantile camp but often riotous. Proclaiming his machismo in an accent that slips from the Frito Bandito to Maurice Chevalier to Slobodan Milosevic, Black curls his eyebrows, twitches his manly buttocks, and leaps into the ring with a belly made for bouncing off ropes.