All Fall Down at Hollinwell Showground (1986)

On July 13, 1986, during a marching band competition at England's Hollinwell Showground in the town of Kirkby-in-Ashfield, nearly 300 students fell silent and collapsed, experiencing shared symptoms like burning eyes, nausea, headaches, and stomach cramps. The mysterious event, known as "All Fall Down," hospitalized 259 individuals. Despite decades of speculation, ranging from mass hysteria to the potential impact of a pesticide sprayed on the field, no conclusive explanation has confirmed the cause.