April 19, 1943 – Bicycle Day – Swiss chemist Dr. Albert Hofmann deliberately takes LSD for the first time. The events of the first LSD trip, now known as “Bicycle Day”, after the bicycle ride home, proved to Hofmann that he had indeed made a significant discovery.

April 19, 1943 – Bicycle Day – Swiss chemist Dr. Albert Hofmann deliberately takes LSD for the first time. The events of the first LSD trip, now known as “Bicycle Day”, after the bicycle ride home, proved to Hofmann that he had indeed made a significant discovery.