Dancing plague of 1518 - There is even controversy concerning the number of deaths
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Dancing plague of 1518 - Wikipedia
https://en.wikipedia.org/wiki/Dancing_plague_of_1518
https://en.wikipedia.org/wiki/Dancing_plague_of_1518
I think the mass hysteria explanation is the more interesting and, to me, more likely explanation. I think it was too widespread to blame on ergot poisoning.
Yeah, it makes you think what's going through a persons mind...
I wouldn't rule out the food poisoning - we have documented examples of whole villages and cities succumbing to sickness because of polluted water source or wrong materials being used for the water supply.
If it were geographically restricted, I would think food poisoning was more likely, but it was spread over a wide area.