A farmer fell from the sky

Here we're missing a syllable, and the rhythm stumbles. But at least the "faller" has some relevance now.

It's not easy to get all the elements to be present at the same time !

For the fifth line - how about

And he said, "Sure enough! Pigs may fly!"

But somehow i'd like it to be about how he shows/teaches us how to make them do it. This way it's an accidental occurrence he happens to stumble across. (happens to fall into?)