I would guess that was likely caused by an involuntary (nothing to do with intellect or emotion) physical reaction stemming from a certain derivative of alcohol being present in the body during metabolization...

"First the drinker takes a drink (for whatever reason or reasons);
"Then the drink takes a drink..." << an involuntary physical reaction
"Then drink takes the drinker." --unknown

That does not happen for most people who drink, but it certainly did with me!