I wrote this for a contest at the New Scientist magazine. I thought what the heck, maybe someone will like it. And no, I won't explain it, because that spoils the whole thing.
There is no Such Thing as Free Energy
I wished a cold drink was still a possibility, and looked out, across the baked clay that used to be a swamp. The hatch closed and we started our long trip to the stars, cursing the inventor of the perpetual motion engine all the way.