Think your seeing ghosts or aliens? You might need to clean your basement!

https://nationalpost.com/news/world/the-truth-behind-haunted-houses-toxic-moulds-can-cause-severe-psychosis-and-hallucinations-researchers-say#:~:text=The%20idea%20is%20that%20certain,to%2Ddetect%20fumes%20they%20project.

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Kwek00 · 41-45, M

Well... yeah.
LSD got discovered (not invented) by a study on ergot, which is a mold that grows in grains. Next to having creating some serious health issues, ergot can also induce a moment of "madness" considering the LSD component. If the substance ended up in some bakers bread, and entire town could be effected. For more information, see "ergotism".

SOURCE: https://en.wikipedia.org/wiki/Ergotism

ElwoodBlues · M

@Kwek00 Ergotism was even put forth as an explanation for the 1692 'witch hysteria' that gripped Salem Massachusetts.