Last Updated : May 21st, 2006
You can duplicate any item in the game by trying to equip arrows while already drawing an arrow into your bow and going into your inventory. After trying to re-equip your arrows drop an item from your inventory. That item will be duplicated on the ground as many times as the amount of arrows you tried to equip. View the video below to see this in action.
You can see an extremely funny example of this glitch with hundreds of watermelons here.