" We usually think of beavers as sweet little creatures who build dams, but that’s not how a constipated Renaissance man would view them; a constipated Renaissance man would view them as his relief and his cure. You see, the beaver has two sacs in his groin that contain a noxious and utterly disgusting oil that acts as a very effective laxative. This very valuable liquid was known as castor oil. The "

― Mark Forsyth , The Etymologicon: A Circular Stroll through the Hidden Connections of the English Language