Will-o'-the-wisp is a ghostly light sighted around swamps or marshy bodies of water. They are rumored to appear in Grand Theft Auto: Vice City.
The original color of this light may vary from green to a yellow hue. The origins of the lights are debated among the scientific community. Some put forward theories that these are caused by something natural like fireflies or honey fungus, or even a reflection of the moon in water.
In GTA Vice City, such sightings are reported around the Leaf Links golf course over the Ponds and the Vice City River. Both their origin and authenticity are unknown. However, the glow from the water could be mistaken for the orb, depending on the weather of the city.