Halloween Jack O Lanterns wait for you at the foggy bus stop. A jack-o'-lantern is typically a carved pumpkin. It is associated chiefly with the holiday of Halloween and was named after the phenomenon of strange light flickering over peat bogs, called ignis fatuus or jack-o'-lantern. In a jack-o'-lantern, typically the top is cut off, and the inside flesh then scooped out; an image, usually a monstrous face, is carved onto the outside surface, and the lid replaced. It is typically seen during Halloween.