Geneva ? It must’ve been quite a party.

The inventor of LSD celebrated his 100th birthday Wednesday – in good health and with plans to attend an international seminar on the hallucinogenic.

Albert Hofmann discovered lysergic acid diethylamide-25 in 1938 while studying the medicinal uses of a fungus found on wheat and other grains at the Sandoz pharmaceuticals firm, now part of Novartis. And he became the first person to test the drug when a tiny amount of the substance seeped on to his finger during a repeat of the laboratory experiment in April 1943.

“I sat down at home on the divan and started to dream,” Hofmann told Swiss television network SF DRS about his first experience with LSD. “I had wonderful visions. What I was thinking appeared in colors and in pictures. It lasted for a couple of hours and then it disappeared.”

Hofmann, who also has had bad experiences with the drug, continues to insist that the controversial substance should be used as a medical treatment, particularly for psychiatric research.