‘Barbarians at the Gate’

Can stratospheric high finance, which appears so tedious and complicated on paper, really be this much of a hoot? Former Nabisco president F. Ross Johnson (James Garner, right) delivers one-liners, double-entendres and sight gags in a wheeling-dealing Wall Street atmosphere polluted by greed, deception and tobacco smoke (HBO early Tuesday at 12:15 a.m.).