Taken from John Scalzi's website http://www.scalzi.com
With choices like An Algonquin Round Table Christmas (1927) , where Dorothy Parker gets sloshed live on the radio; or Ayn Rand's A Selfish Christmas (1951) makes it difficult to choose from a favorite.
But if I must...it will have to be a two way tie between "The Village People in Can't Stop the Christmas Music -- On Ice! (1980)"
"The Village People mobilize to save Christmas after Santa Claus (Paul Lynde) experiences a hernia. Thus follows several musical sequences -- on ice! -- where the Village People move Santa's Workshop to Christopher Street, enlist their friends to become elves with an adapted version of their hit "In The Navy", and draft film co-star Bruce Jenner to become the new Santa. All in a sequence which involves stripping the 1976 gold medal decathlon winner to his shorts, shaving and oiling his chest, and outfitting him in fur-trimmed red briefs and crimson leathers to a disco version of "Come O Ye Faithful." Peggy Fleming, Shields and Yarnell and Lorna Luft co-star"
"A Canadian Christmas with David Cronenberg (1986)"
" In this 90-minute event, Santa (Michael Ironside) makes an emergency landing in the Northwest Territories, where he is exposed to a previously unknown virus after being attacked by a violent moose. The virus causes Santa to develop both a large, tooth-bearing orifice in his belly and a lustful hunger for human flesh, which he sates by graphically devouring Canadian celebrities Bryan Adams, Dan Ackroyd and Gordie Howe on national television. Music by Neil Young."