Just before leaving China for Chinese New Years, went to a "wine bar" for a glass. (It's the only place that sells reasonably priced Californian wines near my house.)

Ordered a glass wine and the waitress came with my glass of wine and a small bowl of rock sugar.

Never had this happen when I am in Shanghai but in small 2nd-3rd tier cities, it has happened enough times for me to not be surprised anymore.