Letterman vs O'Reilly, Round 2

Tonight's Late Show face-off between David Letterman and Bill O'Reilly — their first since January, when Dave called the Fox News front man 60 percent full of "crap" — offers more acrimony, despite a bid by Bill to nip their beef in the bud. In a tape previewed by the New York Post's Page Six, Letterman calls O'R a "bonehead," then provokes the pundit by citing the "heinous, dangerous violence in Iraq." O'Reilly takes issue with the characterization of President Bush as "an evil liar," to which Dave responds, "You're putting words in my mouth, just the way you put artificial facts in your head." Good times. Watch the rest tonight on CBS.