What was the name of " The Simpsons " episode that sung the parody Christmas song ?
This special was spoofed as " Christmas with the California Prunes " in the 2003 Christmas episode of " The Simpsons " ( " ' Tis The Fifteenth Season " ) The Prunes sing " O Pruney Night " ( a parody of " O Holy Night " ) which includes the lines : " O Pruney Night , the stars are slightly wrinkled We are the fruit that your grandmother loves " .