Once upon a time machine he fashioned from a box

With nothing more than crayons and a cache of broken clocks,

The little boy went scooting down the corridors of time

And it was all so easy for a young and open mind.

But now the boy’s a physicist and studies all his days

To learn to build a time machine in complicated ways,

And every day it’s clearer what his facts and figures mean:

That only little boys can build a real time machine.