"Let's be crazy," said Y one day.
X looked at him dubiously.

"I think it'd be fun," said Y a few days later.

"Well?" asked Y the next week.
"Oh for Chrissakes," said X.

But eventually he gave in.
So X became Y^X.
And Y became X^Y.

"This is too confusing," said the other letters.
"Y^X + X^Y = a hot mess," said all the numbers.

So they had to switch back.
But every once in a while, in private —