" As he turned, he happened to catch sight of Dai-yu, who was sitting behind Bao-chai, smiling mockingly and stroking her cheek with her finger – which in sign-language means, ‘You are a great big liar and you ought to be ashamed of yourself. "

― Cao Xueqin , The Story of the Stone, or The Dream of the Red Chamber, Vol. 1: The Golden Days (Chapters 1-26)