The king answered the Chaldeans, "This is a public decree: if you do not tell me both the dream and its interpretation, you shall be torn limb from limb, and your houses shall be laid in ruins. But if you do tell me the dream and its interpretation, you shall receive from me gifts and rewards and great honor. Therefore tell me the dream and its interpretation." They answered a second time, "Let the king first tell his servants the dream, then we can give its interpretation." The king answered, "I know with certainty that you are trying to gain time, because you see I have firmly decreed: if you do not tell me the dream, there is but one verdict for you. You have agreed to speak lying and misleading words to me until things take a turn. Therefore, tell me the dream, and I shall know that you can give me its interpretation." The Chaldeans answered the king, "There is no one on earth who can reveal what the king demands! In fact no king, however great and powerful, has ever asked such a thing of any magician or enchanter or Chaldean. The thing that the king is asking is too difficult, and no one can reveal it to the king except the gods, whose dwelling is not with mortals." (NRSV 2:5-11)
The king answered and said to the Chaldeans, The thing is gone from me: if ye will not make known unto me the dream, with the interpretation thereof, ye shall be cut in pieces, and your houses shall be made a dunghill. But if ye shew the dream, and the interpretation thereof, ye shall receive of me gifts and rewards and great honour: therefore shew me the dream, and the interpretation thereof. They answered again and said, Let the king tell his servants the dream, and we will shew the interpretation of it. The king answered and said, I know of certainty that ye would gain the time, because ye see the thing is gone from me. But if ye will not make known unto me the dream, there is but one decree for you: for ye have prepared lying and corrupt words to speak before me, till the time be changed: therefore tell me the dream, and I shall know that ye can shew me the interpretation thereof. The Chaldeans answered before the king, and said, There is not a man upon the earth that can shew the king's matter: therefore there is no king, lord, nor ruler, that asked such things at any magician, or astrologer, or Chaldean. And it is a rare thing that the king requireth, and there is none other that can shew it before the king, except the gods, whose dwelling is not with flesh. (KJV 2:5-11)
Here, Nebuchadnezzar's pride morphs into a sort of insanity. He refuses to tell his wise men the dream he wants them to interpret. It's a bizarre and strange thing to do. It seems that he wants evidence of a real supernatural power behind the dream interpretation by making the conditions so harsh.