《汉书·传·韦贤传》
韦贤死后，玄成在官位上听到噩耗，又听说自己应当做继承人，玄成深知遣并不是父亲韦贤一贯的意思，于是便假装犯了痴狂病，睡在床上大小便，乱说一气，狂笑不止。
贤薨，玄成在官闻丧，又言当为嗣，玄成深知其非贤雅意，即阳为病狂，卧便利，妄笑语昏乱。
After Wei Xian died, Xuancheng heard the bad news in his official position and heard that he should be the successor. Xuancheng knew that the dying wish was not his father Wei Xian’s will, so he pretended to suffer from a madness, peed in his bed, spoke nonsense and laughed wildly.