0:00 In July of 1518, a woman named Frau Troffea stepped out of her house in Strasbourg and began to dance.0:07 Now, last time we talked about how a single, tangible object — Captain Jenkins’ severed ear — could spark a nine-year war.0:17 This is different.0:18 There was no object, no weapon, no declaration.0:22 Just a woman, dancing silently in the street.0:25 And she didn't stop for almost a week.0:28 Within a month, she was joined by over four hundred other people.0:33 They weren't celebrating.0:35 They weren't having fun.0:37 They were dancing uncontrollably, their faces contorted in agony or a kind of trance.0:43 They danced until their feet bled, until they collapsed from exhaustion, strokes, heart attacks.0:51 Dozens of them, maybe more, literally danced themselves to death.0:56 This was the Dancing Plague.0:58 And here’s where it gets truly bizarre.1:01 The city authorities saw this happening, and their medical diagnosis was… "hot blood." They believed the dancers just needed to sweat out the fever.1:12 So what was their prescription?1:15 More dancing.1:16 I’m not kidding.1:17 They cleared out the guildhalls, they built a massive wooden stage in the public market, and they hired professional musicians to play pipes and drums around the clock.1:30 They thought if they just encouraged the mania, it would burn itself out.1:36 Imagine being so terrified, so trapped in your own body, and the people in charge just turn up the music.1:44 So what was going on?1:45 The easy, modern answer people reach for is poison.1:49 Specifically, ergot — a fungus that grows on damp rye grain.1:54 It can cause hallucinations and violent muscle spasms.1:58 It's the same fungus from which LSD was first synthesized.2:03 So, case closed, right?2:04 A town accidentally got high on moldy bread.2:08 Except...2:08 the analogy breaks.2:10 The symptoms don't really match.2:12 Ergotism causes seizures, convulsions.2:15 Not coordinated, hours-long, weeks-long dancing.2:19 Plus, ergot is a vasoconstrictor; it cuts off blood flow.2:23 People who get it are more likely to get gangrene than to dance a jig.2:29 So if it wasn't the bread, what was it?2:32 The more unsettling answer is that it was a plague of the mind.2:37 A mass psychogenic illness.2:39 Think of the context.2:40 This is the early 16th century.2:43 Strasbourg was wracked by famine, poverty, and syphilis.2:47 Life was brutal, short, and saturated with a very specific kind of supernatural terror.2:54 They had a patron saint, Saint Vitus, who was known to curse sinners by sending them into a frantic, uncontrollable dance.3:03 So here's the theory.3:05 You have a population under extreme psychological stress.3:09 They are primed by their culture to believe that a saint can literally possess them and make them dance to death.3:18 Then one person, Frau Troffea, starts doing it.3:21 Her breakdown becomes the spark.3:24 For her neighbors, seeing it happen CONFIRMS the belief.3:28 The fear becomes a trigger.3:30 It’s a social contagion that spreads not through a virus, but through sight and belief.3:37 It’s like a software bug in the human brain, exploited by extreme stress.3:43 We look for a pattern twin to this, and it’s not in medicine.3:47 It’s in finance.3:49 It’s a bank run.3:50 One person pulls their money out.3:52 Then another.3:53 Suddenly, the belief that the bank is failing BECOMES the reason it fails.3:59 The panic is the mechanism.4:01 The Strasbourg authorities thought they were dealing with a physical ailment, when they were actually facing a crisis of belief.4:11 Building a stage and hiring pipers for a bank run is… well, it’s exactly as effective as you’d think.4:19 What’s terrifying about the Dancing Plague isn't that it’s a medical mystery we can't solve.4:26 It’s that we can.4:27 It shows that a story — a shared, powerful, terrifying story — can get so deep inside our heads that it can hijack our bodies and kill us.4:38 The stage they built in Strasbourg wasn't a cure.4:41 It was an altar, for a god nobody wanted to worship.
