The text is about Bicycle Day, which commemorates the first intentional ingestion of LSD by chemist Albert Hofmann on April 19, 1943. This event has become a part of popular culture and is associated with psychedelic experiences. Hofmann's bicycle ride home after taking LSD led to the first documented psychedelic experience. The effects of LSD, as described by Hofmann, included sensory distortions and hallucinations. This event has been depicted in various forms of media and has become a symbol in the counterculture movement.

• Bicycle Day commemorates the first intentional ingestion of LSD by chemist Albert Hofmann on April 19, 1943
• Hofmann's bicycle ride home after taking LSD led to the first documented psychedelic experience
• The effects of LSD included sensory distortions and hallucinations
• This event has been depicted in various forms of media and has become a symbol in the counterculture movement