Is it possible to get drunk without drinking a drop of alcohol? Yes, it turns out, thanks to something called "auto-brewery syndrome."A Texas man who would get drunk at random times while swearing up and down that he hadn't been drinking. Doctors isolated him in a booze-free hospital room for 24 hours and, sure enough, his BAC level magically rose. Or not so magically: It seems he had a lot of brewer's yeast in his gut—he is, or was, a home brewer—and when he ate carb-rich foods, the yeast got busy fermenting.