The hallucinogenic Pain de Provence mystery I've been aware of the this story, where many people in a village called Pont-Saint-Esprit in Southern France became temporarily insane, for a few years now. The accepted theory was that some bread flour had become contaminated with ergot, a toxic fungus. There are theories also that some of the hysteria of the Salem witch trials was fueled by the effects of ergot poisoning. This possible revelation that the bread of Pont-Saint-Esprit's poor citizens was purposefully poisoned by a government agency is really chilling.