The following is the result of an in depth research project I've been working on since 2007. During this time, I have been following closely the effects of alcohol on your ability to speak different languages.
Here is a chart:
*Horizontal axis, number of alcoholic drinks consumed, Vertical Axis, ability to speak
Findings-Alcohol aides in the ability to speak, as you lose your inhibitions. However, binge drinking, ie more than two will significantly lower your ability to speak any languages (including your mother tongue.) While these findings will vary based on your initial ability to speak a language, your weight, and alcoholic tolerance, it's safe to say that a limited amount of alcohol is beneficial.
Conclusions-Booze doesn't actually make you fluent, but you definitely feel like you are.