South Park - Mr. Hankey, the Christmas Poo Season 1 Episode 9
The kids discover that Kyle is Jewish, and therefore doesn't celebrate Christmas. Kyle suggests he could still participate in the annual Christmas play by singing a song about Mr. Hankey the Christmas poo, but since nobody else believes in talking poo, Kyle is committed to a mental institution. Meanwhile, Christmas is in danger of being completely ruined when the town wipes all the spirituality out of the holiday to avoid offending anyone.
Links
Tudou
Megavideo