Albert Hoffman takes the first acid trip

73 years ago yesterday, Albert Hoffman discovered LSD---or rather experienced its effects after an accidental dose:

“Last Friday, April 16, 1943, I was forced to interrupt my work in the laboratory in the middle of the afternoon and proceed home, being affected by a remarkable restlessness, combined with a slight dizziness. 

At home I lay down and sank into a not unpleasant, intoxicated-like condition characterized by an extremely stimulated imagination. In a dreamlike state, with eyes closed (I found the daylight to be unpleasantly glaring), I perceived an uninterrupted stream of fantastic pictures, extraordinary shapes with intense, kaleidoscopic play of colors. After some two hours this condition faded away.”

After intentionally taking the drug again to confirm that it had caused this strange physical and mental state, Dr. Hoffman published a report announcing his discovery, and so LSD made its entry into the world as a hallucinogenic drug."