Oinomancy

Oinomancy (or oenomancy or œnomancy) is a form of divination conducted by examining patterns in wine. An ancient technique, oinomancy was performed by a priestess known as a Bacchante, and protected by Bacchus, the Roman god of wine. Oinomancy is still practiced today, but is rare in the United States. 
Oinomancy could be performed in a number of ways: