We can always use more case studies of insanity that aren't religion, right?
Well, Miracle Mineral Supplement is my new go-to example for Bad Things happening to people with low epistemic standards. "MMS" is a supposed cure for everything ranging from the common cold to HIV to cancer. I just saw it recommended in another Facebook thread to someone who was worried about malaria symptoms.
It's industrial-strength bleach. Literally just bleach. Usually drunk, sometimes injected, and yes, it often kills you. It is every bit as bad as it sounds if not worse.
This is beyond Poe's Law. Medieval blood draining via leeches was far more of an excusable error than this, they had far less evidence it was a bad idea. I think if I was trying to guess what was the dumbest alternative medicine on the planet, I still would not have guessed this low. My brain is still not pessimistic enough about human stupidity.
English is a lot better in that respect than most languages in the Indo-European family (and Hebrew, just because I happen to know it). Many languages have mandatory gender for all nouns. Not just "he" vs. "she", but "he-chair" vs "she-sun". In those languages you can't talk about something without knowing its gender - masculine, feminine or neuter. You can't address a person in Hebrew without knowing their gender - not even to ask for their name. (Think how fun that makes replying to email.)
My two mother tongues are Russian and Hebrew, but I read and write more in English. Every time I need to write something in Hebrew, I become angry at how gender forces its way to my attention.
ETA: I'm sure you know this already, but it was worth saying clearly.