“I think we have to regard this experiment as a failure,” Princess Celestia said, her magenta eyes regarding the huge, furry orb that had taken shape in the skies above Equestria with interest. “Still, I have to commend you on your ingenious solution to a problem that should not have existed, Twilight.”

Twilight reddened slightly; the whole thing had gotten out of hoof relatively quickly, and the only way to save the planet from the rapidly-multiplying cannibalistic guinea pigs had been to launch them into space. There, their mass had been enough to form its own gravitational pull, creating a second moon. They would continue to grow until they collapsed into a quantum singularity, thus erasing the problem.

“Still,” Celestia added, “we'll need a princess to raise and lower this monstrosity each day.”

“Not it,” Twilight and Luna said at the same time.

In the background, Cadance made a huffy noise.