In August and September 1944, the small town of Mattoon, Illinois, was gripped by panic over a mysterious figure known as the 'Mad Gasser,' who was allegedly spraying a paralyzing gas into homes. Over a period of two weeks, more than 30 people reported symptoms such as nausea, weakness, and paralysis, and the town was thrown into a state of terror. The incident, now widely considered a case of mass hysteria, has become a classic example of how collective anxiety can manifest in physical symptoms.

The Mad Gasser of Mattoon has been the subject of numerous poems, stories, and songs that explore the nature of fear and the power of suggestion in small-town America. The event is often cited in discussions of mass psychogenic illness and has inspired works that delve into the psychology of paranoia and the fragility of social order. It serves as a reminder of how easily communities can be destabilized by rumor and the unknown.