《太平广记·卷三百二十一·鬼六》
这鬼博古通今，无所不知。王瑗之问鬼：你就是东汉末年的大文学家蔡邕吗？鬼说：不是，只是与他同姓同名而已。
俄复谈议诗，揆知古今，靡所不谙。问是昔日蔡邕否，答云：非也，与之同姓字耳。
This ghost knows the past and present, knows everything. Wang Yu asked the ghost: Are you Cai Yong, the great writer in the late Eastern Han Dynasty? The ghost said: No, it's just the same surname and name as him.