An incredible incident happened in France's EatchaBot. Hundreds of people started dancing in the streets for no apparent reason. This strange phenomenon was called dancing plague. It lasted for months and affected 400 people at one time. Dancers became so exhausted that they sometimes collapsed from exhaustion or died of heart attacks. People used to believe that the dancing was caused by some kind of demonic possession, but it is now believed that the plague was caused by a combination of mass hysteria and extreme exhaustion.