Then Nebuchadnezzar the king was astonied, and rose up in haste, and spake, and said unto his counsellors, Did not we cast three men bound into the midst of the fire? They answered and said unto the king, True, O king.12 25 He answered and said, Lo, I see four men loose, walking in the midst of the fire, and they have no hurt; and the form of the fourth is like the Son of God. -- Daniel 3:24-25 (KJV)

Jesus also called himself "the Son of God", therefor some mistakenly correlate Nebuchadnezzar's words with Jesus' claim.

In Hebrew, the last phrase is ben elohim, but elohim is a noun that is always plural in form, and it can refer to “a god,” “gods,” or “God”. Because of the large number of potential meanings of elohim, the word has to be translated from its context and the culture of the speaker. In this context, we know that Nebuchadnezzar worshiped a number of Babylonian gods, and at this time did not recognize Yahweh as an important god. In fact, just a couple of minutes earlier, when the three young men defied him, he denied the power of Yahweh and said, “who is that god that can deliver you out of my hands?” -- Revised English Version Commentary - Spirit & Truth Fellowship International

Other bible translations render Nebuchadnezzar's remark as:

... the aspect of the fourth is like a son of the gods. -- Daniel 3:25 (ASV)

or

... the appearance of the fourth is like a son of the gods. -- Daniel 3:25 (ESV)

or

... the appearance of the fourth is like to a son of the gods. -- Daniel 3:25 (YLT)

or

And the appearance of the fourth is like that of a god! -- Daniel 3:25 (NET2.1)