Festive Fallacies: When the snowman brings the snow

When the nights are long and the days short, there is some solace in the familiarity of classic Christmas songs. But stuffed with pigs-in-blankets and addled on mulled wine, festive pop lyricists seem particularly prone to fallacy. What better way, then, to teach errors in reasoning than to dissect these Xmas classics? Humbug!