Prunes have a reputation for being Nature's laxative. Older people eat them to keep themselves "regular". Really wrinkly old people are described as "prune-faced." So over the years prunes have been the butt of many jokes, despite being a healthy fruit. In fact, the California Prune Board once launched an advertising campaign to try and reverse public opinion about prunes, to give prunes a new image, so to speak.
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