Best Ghost Videos: Black Forest Orbs

The strange floating balls of light in this video taken by Steve Lee in the mid-1990s have yet to be explained. Many video and special effects experts have been stumped by this footage. According to an article by Dennis William Hauck, the family was experiencing other haunting activity at the time. Is this an artifact of a haunting or is this some as-yet-unexplained natural phenomenon, such as ball lighting?