It's a poorly understood weather phenomenon that any of us would be lucky if we saw even once in our lifetime. That is of course, unless you check YouTube. Scope this video captured by some folks partying in the mountains of Colorado.
Some even say that ball lightning may be the real explanation behind the mysterious "foo fighters". The term "foo fighters" (before it became a band name) refers to strange orbs of light that followed Allied aircrafts during some late night dog fights in World War II. Pilots at the time thought the orbs were some kind of enemy technology but they apparently never attacked a plane. After the war, neither side could explain what they were.
If only the WWII pilots had cell cameras . . . then we could compare YouTube clips and see if the visuals match up.