NOBODY WAS INFECTED. EVERYONE GOT SICK.

Mass hysteria is real, and these are 7 of the strangest, most well-documented cases in history. From an entire school that couldn't stop laughing for over a year, to a European vampire panic that put the word "vampire" into the English language, to a nationwide health scare in Singapore that had men convinced their bodies were disappearing — these are the true stories behind history's most bizarre outbreaks of mass psychogenic illness. In this video we break down: 00:00 Intro 02:06 The Tanganyika Laughter Epidemic (1962) 04:42 The Vampire Scare of the 18th Century 09:47 The Dancing Plague of 1518 13:26 The Meowing & Biting Nuns 15:48 The Twitching Epidemic of 1939 17:31 The June Bug Epidemic (1962) 20:32 Koro: Not putting in a description for this one..... No viruses. No toxins. No infections. Just human beings, in groups, under stress, and bodies that reacted in ways science still studies today. If you're into unsolved mysteries, true history, psychology, or just stories that sound too strange to be real but actually happened, subscribe for more deep dives like this one. Disclaimer: This video is intended for educational and entertainment purposes only. The cases discussed are based on historical records, academic research, news archives, and secondary sources, but exact details (dates, case counts, and specific accounts) vary between sources and, in some instances, cannot be fully verified, this is noted where relevant throughout the video. Some events, particularly older historical cases, are documented mainly through limited or secondhand sources, and popular retellings may include embellished or disputed details. This video does not intend to mock, demean, or make light of anyone who has experienced a genuine physical or psychological illness; mass psychogenic illness (sometimes called mass hysteria) produces real, involuntary physical symptoms, and the people affected in every case discussed were genuinely suffering. Viewer discretion is advised.