Math Concepts With Funny Names

(Some of this came from a Reddit post  I read, and some of  the comments on it.) 

Here are theorems with names that I think are funny or unusual. The names are also pointers to the Wikipedia entry on them or some other source.

The Chicken McNugget Theorem

The Ham Sandwich Theorem

The Hairy Ball Theorem

Freshman Dream

The law of the unconscious statistician

The Homicidal Chauffeur Problem

The Pigeonhole Principle (We are so used to this we no longer find it funny, but it is.) 

Eventown and Oddtown 

I am sure there are more and I invite you to comment BUT there are some issues

1) What is funny?

2) I want math concepts that are known. As a counterexample, if Lance proved a theorem and called it the Funkytown Theorem just to get on this list then I'd be surprised. It also would not count. 

3) The name has to be some relevance to the concept. 

And I now list two titles of papers that I find funny. Note that what I write IS the title, even though the first one is an odd title and the second one really does not look like a title.

A minus sign that used to annoy me but now I know why it is there (two constructions of the Jones polynomial)

Some title containing the words "homotopy" and "symplectic", e.g., this one

A problematic category on Jeopardy Raises a Good Question

I was watching a Jeopardy from 2004 (The Game Show Channel is rerunning Ken Jennings streak) and the following question raises a good question.

The contestants where Ken, Jerry, Jennifer.

In Double Jeopardy there was a category  Biblical Name The Same.

The clue was three last names (e.g., Driver, Sandler, West) and the correct response is a biblical name that is the first name of people with that last name (Adam: Adam Driver, Adam Sandler, Adam West).

What happened with Biblical Name The Same for 1200 shows an issue with the question.

Clue: Stewart, Graham, Grimes.

Jerry said  James. This was ruled incorrect.

Ken said Martha. This is correct.

Why is Martha Correct:

Martha Stewart is a well known TV personality focusing on home and hospitality.

Martha Graham was an American modern dancer, teacher, and choreographer (she died in 1991).

Martha Grimes is an American writer of detective fiction.

Frankly, the only one I had heard of was Martha Stewart.

But later they decided Jerry was right and gave him the points (Ken kept his points).  Here was Jerry's argument:

James Stewart was a well known  actor (died in 1997).

James Graham- the show said he was a British General in the 17th Century. I (Bill, not Jerry) looked up James Graham on Wikipedia- there are a lot of them. Four were under the category Military.  Of those, two were British. Neither was a General. One lived 1649-1730 so it may be him.

James Grimes-the show said he was a Senator involved with the impeachment of Andrew Johnson.  I (Bill) looked it up- Grimes was a Republican and it was his party that was trying to impeach, but he (and six other Republicans) broke rank and voted for acquittal. He and the others were bothered that the process had been manipulated. There were rumors they were bribed with patronage jobs or cash though I could not tell if this was true.

The category is problematic.

It is implicit that the three people have to be famous.

This raises two questions and a challenge

Two Questions: What is fame?  How do you measure it? 

Challenges: Let x,y \(\ge\) 2. 

 Find x  last names L1,...Lx  such that there are y first names F1,...,Fy

with F1-L1, F1-L2,...,F1-Lx famous AND

        F2-L1, F2-L2,..., F2-Lx famous AND

DOT DOT DOT

        Fy-L1, Fy-L2,...,Fy-Lx famous.

For the example above x=3 and y=2. You either try the easier case x=2, y=2, or a harder case like x=3, y=3.