“When everything on the ship was being turned upside down, the music remained the same. In the midst of mind-jarring abnormality, it was the one thing that retained its familiarity.”

The Haunted Bookshop (1919)

Whoops! It's Christmas (1959)
Context: The central core of truth is that Christmas turns everything upside down, the upside of heaven come down to earth. The Christmas story puts a new value on every man. He is not a thing to be used, not a chemical accident, not an educated ape. Every man is a V. I. P., because he has divine worth. That was revealed when "Love came down at Christmas." A scientist said, making a plea for exchange scholarships between nations, "The best way to send an idea is to wrap it up in a person." That was what happened at Christmas. The idea of divine love was wrapped up in a person.

Source: Colorless Tsukuru Tazaki and His Years of Pilgrimage

Diogenes, 6.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 6: The Cynics

Whoops! It's Christmas (1959)
Context: A lady, who looked like an animated Christmas tree with packages dangling from every limb, and I bumped and spilled. As I was trying to pick up the packages she gasped out, “Oh, I hate Christmas, anyhow! It turns everything upside down.”
I said, “That is just what it was made for.” But this lofty sentiment did not stop her dirty looks at all. But it is the big thing about Christmas!
Christmas is a story about a baby, and that is a baby's chief business, turning things upside down. It is gross slander on babies that their chief passion is food. It is rearrangement! Every orthodox baby rearranges everything he sees, or can get his little hooks into, from the order of who's important in the family, to the dishes on the table. A baby in a family divides time into two eras, just as Christmas does. There is B. C., which means "before child," and A. D., which means "after deluge."

Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter LVIII: On Being

Attributed to Lee in "Harpy Hall of Fame: Mother Ann Lee (1736-1784)" at The Pursuit of Harpyness (4 February 2009) http://www.harpyness.com/2009/02/04/harpy-hall-of-fame-mother-ann-lee-1736-1784/; no earlier attributions have as yet been located.
Disputed

Source: The Space Merchants (1953), Chapter 8 (p. 105)

Source: Fares, Please! (1915), Everything Upside Down, p. 185
Context: Christmas turns everything upside down. This is the central truth of the incarnation — "Immanuel, God with us." The upside of heaven come down to earth. "The Word was made flesh, and dwelt among us, and we beheld his glory,... full of grace and truth." Men miss the entire meaning of Jesus when they see in him the highest upreach of man; he is God reaching down and making common cause with man's struggle. The meaning of Christmas puts down the mighty things in men's minds from their seats — place, riches, talents — and exalts the things of low degree — humility, simplicity, and trust.