I just heard about this on NPR. An artist created a machine that "eats" food, digests it and shits the waste onto a conveyor belt. Here's the description:
The food is chewed by a garbage disposal device before traveling on a 27-hour-long digestive trajectory, through six glass vats connected by tubes and pipes, pumps and various electronic components that are Cloaca's stomach, pancreas, and small and large intestines. The "digesting" food is constantly kept at a precise 37.2 degrees centigrade and each of Cloaca's "organs" is full of computer-monitored enzymes, bacteria, acids and bases such as pepsin, pancreatin, and hydrochloric acid. The product finally goes through a separator and the remaining solids are extruded onto a conveyer belt.