It seems you are supposed to stop pouring.

AMES, Iowa – Pouring a glass of wine is rarely an exact measurement, especially in a social setting. While most people think of a glass as one serving, in reality it could be closer to two or three.

We've all probably watched a server oh-so-slowly pour out a skimpy-seeming glass of wine with a double-digit price tag and wondered how much wine, exactly, should be in a restaurant pour. Let's get ...