The first time I visited a sake brewery (or kura, as its called in Japanese) I worried I wouldn’t be able to drive home afterwards. The owner wouldn’t let my glass drain. Every time I thought I could get away with sneaking into the next part of the tour without a refill, he would appear, smiling, generously pouring more liquid into my sample cup.
Later, I discovered he wasn’t just trying to get me drunk, but was following the Japanese tradition called oshaku, where it’s impolite to fill your own glass, and equally as rude for your host to let your glass sit empty. Sake is a social drink, so oshaku is seen as a way of making new friends.
In America, this social custom hasn’t caught fire when it comes to sake consumption (and for future reference, the polite way to refuse additional servings during traditional Japanese social engagements is to leave a tiny bit of sake in your glass, to not encourage refills). In fact, sake has long been considered a cheap, boozy beverage only suitable for sake bombs and cheap sushi dinners — an image many sake enthusiasts and certified specialists are working to change.