There's a reason the Coens make a lot of comedies. They're funny. Read one of their inimitable scripts or see "Burn After Reading," "Raising Arizona," or "The Big Lebowski," and you'll be howling with laughter. Even their "serious" movies are pretty funny. "Hail, Ceasar!" is an out-and-out comedy in the vein of such other period valentines as "The Hudsucker Proxy" or "O Brother, Where Art Thou?" So it's no surprise that hanging out with them in a relaxed way is a huge amount of fun, even if it doesn't amount to much in the way of a ground-breaking 15-minute interview.