What did the miller boast to the king?

The miller boasted to the king that he could turn straw into gold, claiming he had a magical ability that would impress the royal court. His arrogance led him to promise that he could produce vast wealth with just a simple pile of straw. However, when challenged to prove his claim, he faced dire consequences unless he could deliver on his extravagant boast. This tale often highlights themes of greed and the perils of overestimating one's abilities.