What is a smile cup? What's the use?

The so-called "cup" is actually a very traditional divination thing like cashew kernel. There are two pieces, one flat and the other convex. When divining, first ask you the question you want to divine, and then throw it on the ground. If a plane faces upwards and a convex face faces upwards, it means "winning the cup", which means beauty. If both planes are facing up or both convex surfaces are facing up, it is a "laughing cup", which means bad meaning. * * * Throw "win two games" three times to judge the divination result.

Throwing a laughing cup may mean bad.