At one point, having had a few drinks, I got into a long theological debate with a fundy christian who was soap-boxing in front of a large crowd of people. He was doing the whole "Gays will burn, blah blah blah, sodom and gomorrah, blah blah blah" thing, and I started calling him out on stuff left and right. The crowd was laughing as I started taking his points apart, leaving him so flustered that he blurted out this gem in an attempt to refute a point I had made: "Well, Dan Brown in TheDaVinciCode..." "Wait... I'm going to interrupt you here. Are you now attempting to use a novel... a book I would find in the FICTION section of a bookstore, whose author is notorious for
making things up, as a source you are willing to cite in this argument?" "....Yes?" "No, go ahead, I was just wondering." At which point the audience, howling with laughter, shamed him off the 'stage'.