We have often heard of people going overboard during office parties, and doing strange things that they prefer to forget about the next day.
Drinking in a different environment especially one that is not associated with socializing or drinking can make people behave differently which can also be a source of embarrassment.
A recent study seems to explain why even the sober ones lose it during office parties and wake up embarrassed at their behavior. Alcohol certainly lowers inhibitions, but when people drink in familiar surroundings, the brain somehow learns to cope and tolerate, which reflects in people portraying good control over their behavior.
Researchers believe that in familiar environments, the brain actually learns to handle the effects of alcohol, whereas in an unfamiliar environment, the brain is unable to cope with the lowered inhibitory effects induced by alcohol. This may also cause people to indulge in binge drinking.