Diller once quipped: "What I don't like about office Christmas parties is looking for a job the next day."

Santa wears the number 25 of course.

The Treaty of Ghent ended the War of 1812 between the United States and Great Britain. Peace negotiations began in Ghent, Belgium, starting in August of 1814. After four months of talks, the treaty was signed on December 24, 1814.

Feather Christmas trees were first created in Germany in the 1880s. They were made of green-dyed goose feathers which were attached to wire branches.

As part of 1968's Apollo 8 mission, astronauts Frank Borman, Jim Lovell and William Anders spent the night before Christmas orbiting the moon.

Charlemagne reached the height of his power in 800 when he was crowned Emperor of the Romans by Pope Leo III on Christmas Day at Rome's Old St. Peter's Basilica.

Originally released by English pop duo Wham! in 1984, it has since been covered by many artists, including Ariana Grande, Ashley Tisdale, and Jimmy Eat World.

The lyrics in this duet are designed to be heard as a conversation between two people, identified as "mouse" (usually female) and "wolf" (usually male) on the printed score; they have returned to the wolf's home after a date, and the mouse decides it is time to go home, but the wolf flirtatiously invites the mouse to stay as it is late and "it's cold outside."

The holly bears a bark
As bitter as any gall;
And Mary bore sweet Jesus Christ
For to redeem us all.

The song is based on the 1863 poem "Christmas Bells" by American poet Henry Wadsworth Longfellow. Written during the height of the U.S. Civil War, it tells of the narrator's despair, upon hearing Christmas bells, that "hate is strong and mocks the song of peace on earth, good will to men".