All hail the Clan Mackenzie, those beer-swilling, conspiracy-obsessed, tabloid-reading, Rod Stewart-loving, bagpipe aficionados!  The plot line of So I Married An Axe Murderer may ostensibly center around the romance between commitment-phobic Charlie and the thrice married Harriet, but the best scenes in the movie revolve around Charlie and his family.  Stuart (Mike Myers) and May…