The word beku means “should” in Chinese classics and it should not be used in the end of a sentence. From this meaning, a cup which should not be put down came to be called bekuhai. (hai means cup in Japanese)
Some have a small hole in the base which you have to cover with your finger to stop sake leaking, and others have a face of hyottoko (male funny face) or tengu (Japanese goblin). Because of this unique shape, bekuhai is a cup that cannot be put down unless you drink up the sake. The bottom may be sphere or pointed, or something like sorakyu, a cup without foot which cannot stand on its own unless you hold it. Once sake is poured into any of these types of cups, you cannot put them down unless you drink it up. Naturally, games born in Tosa, Kochi prefecture.
There is another drinking game: Many sake cups are placed upside down, and a chrysanthemum flower is placed under one of the cups. Each player flips over one cup in turn. If you lift the cup under which the flower is hidden, the cups already turned over will be filled with sake, and you have to drink all of them. In any cases, people drink a lot of sake and get drunk to enjoy dynamic drinking games that are unique to Kochi Prefecture.