Kykeon
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Kykeon was the drink used at the climax of the Eleusinian Mysteries to break a sacred fast. It was said to be a mix of barley and pennyroyal.
In an attempt to solve the mystery of how so many people over the span of two millennia could have consistently experienced revelatory states during the culminating ceremony, it has been posited that the barley used in the kykeon was parasitized by ergot, and that the psychoactive properties of that fungus triggered the intense experiences alluded to by the participants at Eleusis.
Various modern attempts to duplicate the kykeon using ergot have yielded inconclusive results.