The Mythology & Folklore Database
Once a person who had lost his way offered him two silver groschens if he would lead him home safely. The will-o'-the-wisp agreed, and finally they arrived at the lost man's house. Happy that he was no longer in need of help, he thanked his guide; but instead of the promised payment, he gave him only a small copper coin. The will-o'-the-wisp accepted it, then asked if he could now find his way home by himself.
He answered, "Yes! I can already see my open front door." But stepping toward it, he fell into some water, for everything he had seen had been only an illusion.
The will-o'-the-wisp takes special delight in tormenting drunks making their way homeward from a fair or an evening of drinking. He leads them astray, and when in their drunkenness they can go no further, preferring instead to sleep off their binge out of doors, then he burns them on the soles of their feet. In some regions the people believe that will-o'-the-wisps are the souls of children who died without being baptized. They are seen especially atop graveyard walls. They disappear when one throws a handful of graveyard soil at them.