The most interesting thing about the man who plays the Most Interesting Man in the World, in those TV ads for Dos Equis beer, is that he is interesting, too, perhaps even superlatively so. His name is Jonathan Goldsmith. He’s the one who says, in a Spanishy accent, at the end of each spot, “I don’t always drink beer, but when I do I prefer Dos Equis.” What makes his Most Interesting Man character interesting, besides a preference for spirits, is other traits invented for him by copywriters: At museums, he’s allowed to touch the art. . . . His blood smells like cologne. . . . Sharks have a week dedicated to him. . . . He once had an awkward moment, just to see how it feels. . . . The police often question him, just because they find him interesting. These lines are recited gravely by the narrator of “Frontline” over faux-grainy clips of our Man cliff-diving in Acapulco, or splashing down in a space capsule, or lying in a hospital bed stitching up a wound on his own shoulder while surgeons and nurses stand around idly, chuckling at his jokes.