Bill Barclay's 12 days of Christmas, where he gets drunk singing it...
http://www.mudcat.org/thread.cfm?threadid=45868&messages=51&page=1
Boy Mongoose's version of 12 days
http://www.youtube.com/watch?v=owK5tHjL0aE
Achmed the dead terrorist's "Jingle Bombs"
http://www.youtube.com/watch?v=wskT6YfVB6E