The Merry Pranksters were a group of countercultural figures in the 1960s, known for their colorful personalities and adventurous spirit. Led by Ken Kesey, the author of "One Flew Over the Cuckoo's Nest," they became famous for their cross-country bus trips in a brightly painted vehicle named Furthur. Their journey aimed to promote the use of LSD and explore the boundaries of consciousness. The Pranksters were closely associated with the Hippie movement and the burgeoning San Francisco music scene. They organized events like the Acid Tests, which combined music, art, and psychedelic experiences. Their influence helped shape the cultural landscape of the 1960s, leaving a lasting legacy in American counterculture.