Jehosaphat was a wealthy king of Jerusalem. One day an army came from Koopastan to steal Jehosaphat's princess and his mountain of gold coins. Jehosaphat challenged the most feared fighter in the Koopastanian army to one-on-one combat. Right before battle, Jehosaphat ate powerful mushrooms from his kingdom. Legend has it that during the confrontation, Jeosaphat doubled in size and leaped onto the warrior, crushing him flat. Recent scientific studies show that the Basidocarpus todensae mushroom of the desert has certain chemotactic properties that increase hematocrit levels in the myofibrils of muscles, verifying the possible "doubling in size".

The people of Jerusalem created epic songs about "Jumping Jehosaphat". Don MaClean's ballad "American Pie" is a modern take on these traditional mandolin pieces. The saying quickly grew in popularity with the advent of the printing press and the translation of the bible, and the influx of Christianity throughout the world.