A harsh, creative, and often overlooked punishment is the administering of Castor Oil to a submissive. When given several tablespoons orally it acts as a powerful laxative that tastes beyond horrible going down, and burns coming out. It was a punishment traditionally used in the 20s through 50s. It's safe when done in moderation and even has heath benefits!
This is the only description of the punishment that I think does it justice:
This is the only description of the punishment that I think does it justice:
Among the stimulant laxatives, there are two notable items. The most famous is castor oil, which is a little like peanut oil, but with an ominous aura that lingers on the pallete. One can just feel it slowly worming it's way through the digestive tract, slithering through from end to the other. In less civilized times, it was use to lubricate gears, and as a punishment for cranky children. Most stores still keep this vile substance on the shelves in small bottles. (source)