The farmer was looking into the sky
As he fed beans to his pigs in the sty
And when all the gases
Escaped from there asses
He thought, if I light-up now, those pigs will fly

And Candy, I like your last line change but now there are too many breaks in the rhythm.

Can we bring it back into line:

A farmer looked into the sky
And fed beans to his pigs in the sty.
He said, as the gases
Escaped from their asses,
"If I light up now, pigs will fly!"