I wrote one for a small musical a few years ago put on by a rehab group
"Santa's Lament"... which is a story of Santa losing his memory and wondering what special day is approaching that he can't remember..
It's somewhere between 'This Christmas Tree's got no Balls', 'Why is Rudolf's Nose so Red? (juvenile wino)"
and the more serious 'Homeless in Bethlehem' which is posted in the Mudcat archives...