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American History

12 of History’s Most Baffling Mass Hysteria Outbreaks

Salem witch trials - Halifax Slasher

The crowded city streets of Taipei. Shutterstock

The Taipei Slasher

For a fortnight in 1956, the population of Taipei in Taiwan was terrorized by rumors of a crazed slasher roaming the streets, surreptitiously slicing people with a razor blade as he brushed past them, then disappearing into the crowds and teeming throngs of the city. About twenty-one victims were reported, mostly poor and poorly educated people from the lower classes.

A typical example was that of an older gentleman who told police that he had been slashed by a stranger. After a medical examination revealed that the injury was caused by a blunt object and could not have resulted from a razor, the “victim” admitted that he did not really know how he had been injured, but assumed that he must have been slashed “because of all the talk going around“.

Another example of a phantom slasher attack was caused by incompetent doctors who examined another older gentleman who showed up with a laceration on his wrist. When the patient casually mentioned that a stranger had brushed against him around the same time that he noticed the bleeding, the doctors put two and two together and came up with nine, attributed the wound to the feared slasher, and contacted police. A follow-up examination by more competent doctors revealed that the laceration was simply an old wound that had been reopened by scratching.

In reality, there had never been a slasher, but simply a mass delusion or hysteria, amplified by sensationalist press reporting. After thorough investigation, police concluded that the “victims” had simply suffered the kinds of everyday accidental cuts and slight injuries that most people endure from time to time without hardly noticing. In the fevered atmosphere of the slasher scare, people simply attributed any rip in their clothes or scratch on their bodies to a surreptitious attack from the imaginary slasher. As the final report of the police investigation put it, out of twenty-one reported “victims” of the crazed slasher: “five were innocent false reports, seven were self-inflicted cuts, eight were due to cuts other than razors, and one was a complete fantasy“.

Written by

A lifelong history buff, I developed a particular passion for WW2 history as a child, when I spent hours listening to my grandfather, enraptured, as he recounted his wartime experiences in the British East African Campaign and with the British 8th Army in North Africa.

I graduated with a history BA from George Mason University, then went on to get a JD from the University of Virginia School of Law. After lawyering for a decade, I moved to sunny Rio de Janeiro and a less demanding career, opening a tourism agency in Copacabana.

A big chunk of my free time is spent blogging (you can follow me on Quora https://www.quora.com/profile/Khalid-Elhassan ) or freelance writing, mostly about my favorite subject, history.

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