I have absolutely no idea how to find reference to this at this point because every search I do results in absolute bullshit that’s not related (like apparently the most liquid currency is the diarrhea coin… a problem that didn’t exist a few years ago..), but I recall reading about a practice from like the medieval era or something where special coins were made that contained heavy metals, and when consumed, would induce diarrhea. They would be retrieved, washed, and reused, and even passed down in families.

Today we know how bad of an idea something like that is, but then, like with radiation, it was all ghosts in the blood causing problems. Shitting blood was normalized.