My grandfather claimed to have witnessed ball-lightning as a young man in the UK. The Ball apparently came into his house through the fire-place, floated down the hallway and out through the front door.
Sounds utterly ridiculous I know, but he was a very intelligent, rational and grounded man, and never touched alcohol, so I had no reason to doubt his story.
There are countless other witness accounts of similar ball activity, and if it were not for my grandfather's story, I would be a skeptic.
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