A "BAH, HUMBUG" MOMENT. When did Christmas become the season for giving luxury cars as presents? Lexus has spared us the vignettes of adulterous spouses shopping for forgiveness this year, but I have heard their obnoxious jingle and seen a few pictures of cars with those same red bows. They've been joined by Mercedes and BMW, both with somewhat more clever adverts, and Ford thinks this is the season to push their Lincoln Navigator. Is the up-armored version favored by drug hustlers everywhere?