Fool's Ore is an item from The Legend of Zelda: Oracle of Seasons. This piece of fake Ore serves no purpose, but it can be equipped and swung. It is obtained briefly when the Strange Brothers take Link's Roc's Feather. After following them through their mini-game, Link earns his Roc's Feather back and discards the Fool's Ore.
Interestingly, Fool's Ore can kill any standard enemy in the game with one hit; however, since the item is only in Link's inventory for a limited amount of time, wielded against without the aid of a cheat device is a Fire Pokey which can be found by digging in Subrosia.