Next is the Carol of the Bells as performed by guitarist Gary Hoey:
Ok, so not that weird so far, but here's a genuinely odd one from Jonathan Coulton (with Paul & Storm) called Chiron Beta Prime. Just his description of the song, before he even starts singing, is worth watching...
Well that's weird enough for me. Special thanks to Widgett, who is one-upping me by doing 13 days of Christmas. Anyway, he's responsible for the Bob & Doug McKenzie and Jonathan Coulton songs and has a few other demented holiday songs too...