This is just a glowing ball of energy, floating through the air like Satan's fastball. Or imagine Tinkerbell, only without the 6 inch tall stripper in the middle of the glowy ball and possibly burning everything in its path. That's ball lightning.
Above: Ball lightning...maybe.
Ball lightning is so strange, for the longest time scientists just thought people were making shit up. Witnesses who reported it had the same credibility as UFO abductees.
And while they're at least trying to study it now, we still have no clue how it works. Some people think it's a special kind of static electricity. Some think it's electrified silicon. Some think it's a big ball of What The Fuck that has somehow adopted physical form.
Another theory that's actually taken seriously, despite it being batshit insane, is that ball lightning is caused by singularities, which is something really massive that doesn't actually take up any space, if you can wrap your head around that. That was the theory after some ball lightning left a wake of destruction in Ireland.
Chances of it Happening to YOU:
It's estimated that 1 in 20 Americans have seen ball lightning, meaning that there's probably thousands, of people reading this who have seen it. Granted, you probably mistook it for a UFO, or a Hadouken...
...but you saw it. If you see it again, try to catch it in a jar or something. Scientists want to study that shit.