Song by Tom Lehrer. As with all his work, much of the fun is in the music. But here are the lyrics anyway:

Counting sheep

When you're trying to sleep,

Being fair

When there's something to share,

Being neat

When you're folding a sheet,

That's mathematics!

When a ball

Bounces off of a wall,

When you cook

From a recipe book,

When you know

How much money you owe,

That's mathematics!

How much gold can you hold in an elephant's ear?

When it's noon on the moon, then what time is it here?

If you could count for a year, would you get to infinity,

Or somewhere in that vicinity?

When you choose

How much postage to use,

When you know

What's the chance it will snow,

When you bet

And you end up in debt,

Oh try as you may,

You just can't get away

From mathematics!

Andrew Wiles gently smiles,

Does his thing, and voila!

Q.E.D., we agree,

And we all shout hurrah!

As he confirms what Fermat

Jotted down in that margin,

Which could've used some enlargin'.

Tap your feet,

Keepin' time to a beat,

Of a song

While you're singing along,

Harmonize

With the rest of the guys,

Yes, try as you may,

You just can't get away

From mathematics!

© Tom Lehrer; recorded November 2, 1993, to be played over the credits of a videotape by the Mathematical Sciences Research Institute. Lyrics appear with his written permission. CST Approved.