If you think you know “Mack the Knife,” it’s time for a refresher. — “Oh, the shark, babe, has such teeth, dear And it shows them pearly white. Just a jack-knife has old Macheath, babe, And he keeps it out of sight”. These words are so familiar and yet, they don’t even come close to telling the real story These words and their familiar melody bring memories of a very suave Bobby Darrin to mind, clicking his fingers and moving smoothly…