Eli5: why do people behave differently when drunk?

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I have so many questions. Why do people make strange decisions? Does being drunk reveal a dark side in a person or does completely change the person in control? For example, if someone gets in a fight or abuses someone while they are drunk, does this occur BECAUSE they are drunk, or does it occur because the intoxication is tempting them to make decisions they might have considered doing before?

In: Biology