not seen one in real life but have seen a ufo, I followed it on my bike for about 1/4 mile.
we don't get a lot of lightning where i live. ball lightning is definitely a real thing but i suspect a lot of it is a hallucination, for example ball lightning inside aircraft. everyone reports seeing something different and rarely do the testimonies match. some of this is consistent with the usual human problems, but its also consistent with the emf of the lightning bolt interfering with the mind.
a couple of the short clips in that youtube vid you posted are not ball lightning but rather an electrical arc between two powerlines traveling horizontally down the line. if you search for that you can find some that are quite long. the blue/green color and the smooth horizontal motion gives it away.
some folks in china were able to capture a spectrograph
A scientific team in China fortuitously recorded the first optical spectrum of an example of ball lightning. The ball lightning, which was accompanied by a cloud to ground lightning strike, appears to have consisted at least partially of vaporized soil from the location of the strike. While ball…