Robert Crumb (born August 30, 1943) is a famous American cartoonist and musician. He founded the underground comics movement in the 1960s and early 1970s. He is most famous for the album cover for Big Brother and the Holding Company's "Cheap Thrills", the catchphrase "Keep on Truckin'" and "Fritz the Cat", which was made into a movie without his approval. He also collects 78 rpm phonograph records and plays the mandolin. He was the subject of an award-winning documentary movie made in 1994 called "Crumb".