In this podcast episode, we explore the intriguing mystery of the "Mad Gasser of Mattoon," which unfolded in 1944 when several residents of Mattoon, Illinois, reported being affected by a mysterious gas. The discussion presents two main theories: one suggests that mass hysteria, driven by wartime anxiety and sensational media coverage, was at play, while the other considers the possibility of a real culprit, potentially a disgruntled chemist named Farley Llewellyn. Although a clear answer remains out of reach, the episode examines compelling evidence for both perspectives, shedding light on the challenges of investigating such an unusual incident and the limitations of historical records.