Furthur was a 1939 International Harvester school bus purchased by author Ken Kesey in 1964. The bus was stripped down and remodeled inside and out for a psychedelic excursion across the country with Kesey and his Merry Pranksters on board. The destination sign on the bus was painted to read "Furthur", hence the name. Beat legend Neal Cassady was the driver of the famous bus on its original trip to New York for the opening of Kesey's new book, Sometimes A Great Notion. The trip was filmed by Kesey's friends and is now sold on intrepidtrips.com as "Intrepid Traveller and His Merry Pranksters Leave in Search of A Kool Place". The bus is mentioned in the Grateful Dead song "That's It for the Other One" in the verse "the bus came by and I got on, that's when it all began...yeah Cowboy Neal at the wheel a bus to never never land". More can be read of Furthur's adventures in Tom Wolfe's book The Electric Kool Aid Acid Test.

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