There are dozens of ethnic minority groups in China have their own folklore: much of which contains valuable historical and cultural information as well as many unique myths.
Historic Chinese Legends, Tales and Idioms
Historic Chinese Legends, Tales and Idioms » Ban Men Nong Fu
This idiom literally means "to wield an axe in front of Lu Ban" and mocks someone who makes a fool of himself by showing off in front of an expert. It was coined by a Ming Dynasty scholar.