The term “jack-o’-lantern” was first applied to people, not pumpkins. As far back as 1663, the term meant a man with a lantern, or a night watchman. Just a decade or so later, it began to be used to refer to the mysterious lights sometimes seen at night over bogs, swamps, and marshes.
These ghost lights—variously called jack-o’-lanterns, hinkypunks, hobby lanterns, corpse candles, fairy lights, will-o’-the-wisps, and fool’s fire—are created when gases from decomposing plant matter ignite as they come into contact with electricity or heat or as they oxidize. For centuries before this scientific explanation was known, people told stories to explain the mysterious lights. In Ireland, dating as far back as the 1500s, those stories often revolved around a guy named Jack.
LEGEND HAS IT
As the story goes, Stingy Jack—often described as a blacksmith—invited the devil to join him for a drink. Stingy Jack didn’t want to pay for the drinks from his own pocket, and convinced the devil to turn himself into a coin that could be used to settle the tab. The devil did so, but Jack skipped out on the bill and kept the devil-coin in his pocket with a silver cross so that the devil couldn’t shift back to his original form. Jack eventually let the devil loose, but made him promise that he wouldn’t seek revenge on Jack, and wouldn’t claim his soul when he died.