I remember reading about ball lightning when I was a kid — it was one of those unexplained mysteries. Well, no more: Scientists have created it in a lab:

Ball lightning could soon lose its status as a mystery, now that a team in Brazil has cooked up a simple recipe for making similar eerie orbs of light in the lab, even getting them to bounce around for several seconds. Watch a movie of the boucing balls here.

Thousands of people have reported seeing ball lightning, a luminous sphere that sometimes appears during thunderstorms. It is typically the size of a grapefruit and lasts for a few seconds or minutes, sometimes hovering, even bouncing along the ground.

Now, what about spontaneous human combustion?