In a party with coworkers, the Japanese have to be polite to elderly people because of the strict hierarchical relationship in their company. If their boss’s glass likely to be empty, they have to pour the liquor for him/her, and this manner is called “Oshyaku” in Japanese. In Japan, there is common that women pour the liquor for men. To do oshyaku, there has many unspoken rules. You will find some rules in this animation.