“Hip and happening” isn’t the usual phrase that comes to mind when you think about the Internal Revenue Service. A more common stereotype is captured by Will Ferrell’s character, IRS Agent Harold Crick in the movie “Stranger Than Fiction.” Harold Crick counts the strokes when he’s brushing his teeth. His wristwatch is his guardian angel. He explains to the woman he’s wooing (and simultaneously auditing): “IRS agents, we’re given rigorous aptitude...