Ken Kesey, author of One Flew Over the Cuckoo’s Nest, led the Merry Pranksters—a wild band of counterculture trailblazers who crisscrossed the country in a psychedelically painted bus called Furthur in 1964, spreading the gospel of LSD. Their legendary Acid Tests—chaotic, neon-lit parties laced with psychedelics and soundtracked by the Grateful Dead—became ground zero for the hippie movement. The final blowout, dubbed the “Acid Test Graduation,” took place in 1966 in San Francisco, signaling Kes