I never had gold sake, but drank my share of regular sake before. It definitely has a morning after ass kicking feel if your not used to it. You are so right about the politness culture. The wife and I often sit and reminisce about our time living in OKinawa.
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I've also found that cheap sake can really kick your butt even if you only have a very little. Higher quality stuff is usually more forgiving, but even that can be bad if you have too much.
