Uromancy is divination by observing a person's urine. Practiced by the ancient Greeks, the uromancer would gaze into urine to see visions. Uromancy was sometimes used to divine whether a woman was a virgin, pregnant, or had a spouse. The Roman author Pliny spoke of "spitting into the urine the moment it is voided" to reverse a bad omen. Try it. You'll like it.

Clifford A. Pickover, Dreaming the Future (77)