A strange affliction began in France during the Middle Ages, when one nun at a convent began to meow like a cat. This soon led to the whole group beginning to act in the same way, with the meowing lasting for hours at a time and keeping those in the nearby village awake throughout the night. Experts believe that the isolated life that the nuns lived left them vulnerable to this type of hysteria.
Bin Laden Itch
The so-called Bin Laden Itch was a mass panic that occurred between October 2001 until the summer of the next year, with thousands of reports of rashes on the backs and arms of school children. In turn, this led to fears that terrorists could cause some sort of biochemical weapon to release a virus that would infect youngsters due to the recent 9/11 attacks. The large number of cases were put down to nurses over-reporting instances and a high degree of fear in parents.