Quote Originally Posted by Riverkilt
So we were both right. He only had three drinks in terms of glasses of booze. But each glass held the equivalent of three drinks, so he had the same amount of alcohol contained in nine regular drinks. ....

Ya gotta know what's in them things....
Ron's right. Just because there is only one glass, doesn't mean it's only one drink. You can put a lot of alcohol in a glass if there's not much diluting it. And let's not forget the fishbowl sized drinks you get in some places. It's only one glass, but it's got the equivalent of 4-6 drinks worth of alcohol in it.