Jan 16
This is a very common Chinese expression. 太阳从西边出来了 means “the sun is rising in the west”. It is used to describe a very unusual event. Something that one normally would never expect to happen, just like the fact that the sun would rise in the west.
For example when the husband never cooks, and one day he cooks a delicious dinner. Then his wife would say:
哟，今儿太阳从西边出来了？
Or when her son, who never does his homework voluntarily, one day suddenly does them right after dinner:
哇，你还知道做作业？今天太阳可从西边出来了！