For those unfamiliar, Bicycle Day is an annual celebration of Swiss scientist Albert Hoffman’s first intentional ingestion of the chemical compound LSD-25 on April 19th, 1943, following his discovery of the compound’s mind-altering properties three days earlier. Bicycle Day takes its name from Hoffman’s trippy bike ride home, a fateful trip (in both senses of the word) whose impact still permeates both mainstream and counterculture today.