Le Roy High School Twitching Outbreak (2011)

In October 2011, a mysterious outbreak of violent twitching and jerking affected initially two and later 20 people, mostly teenage girls, at Le Roy Junior/Senior High School near Buffalo, New York. Concerns arose about water supply and contamination, but environmentalists found no evidence. Dr. Laszlo Mechtler attributed the symptoms to mass hysteria, which social and mainstream media attention exacerbated, and noted that many affected individuals returned to normal by the end of the school term.