This is the first documented experience of the effects of ingesting psychedelic mushrooms recorded in a medical journal. In a letter to the London Medical and Physical Journal in 1799, Dr. Everard Brande describes attending to a family who was acting strangely, laughing, and having visions after eating a stew they made with mushrooms picked in London’s Green Park. Upon examination, the mushrooms were found to be Agaricus glutinosus and later reclassified as Psilocybe semilanceata, aka Liberty Caps.