Christmas Math Jokes

Q: Why do mathematicians often confuse Christmas and Halloween?
A: Because Oct 31 = Dec 25.

Q: What’s purple, round, and doesn’t get much for Christmas?
A finitely presented grape.

In a previous post I had a Calculus Christmas Carol, this is the first verse (sung to the tune of “Oh, Christmas Tree”):

Oh, Calculus; Oh, Calculus,
How tough are both your branches.
Oh, Calculus; Oh, Calculus,
To pass what are my chances?
Derivatives I cannot take,
At integrals my fingers shake.
Oh, Calculus; Oh, Calculus,
How tough are both your branches.

Surely someone out there knows some funny Christmas Math Jokes!!
I’ll try to make some up myself, and will let you know with what I can come up with. In the mean time, here are:

Some Christmas Riddles – that are non mathy 🙁

Q: What do you have in December that you don’t have in any other month?
A: The letter “D”.

Q: What do you call a chicken at the North Pole?
A: Lost.

Q: Just before Christmas, an honest politician, a generous lawyer
and Santa Claus were riding in the elevator of a very posh hotel. Just
before the doors opened they all noticed a $20 bill lying on the floor.
Which one picked it up?
A: Santa of course, because the other two don’t exist!

Q: What happened when Santa’s cat swallowed a ball of yarn?
A: She had mittens.