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You would expect the chief justice of the United States Supreme Court to know how to swear in a new President — the words of the oath are written into the Constitution, after all. But Chief Justice John Roberts slipped up a bit.

First, Barack Obama, who technically became President a few minutes earlier — the transfer of power happened automatically at noon — jumped the gun a bit, starting to recite the first line before Roberts had finished saying it. Then Roberts slightly mangled a bit of the speech, referring to "the office of President to the United States." He also misplaced the word "faithfully."

Obama started to recite the words then stopped, casting a look at Roberts that essentially said: "Wanna try that again?" Then they got it right.

The video above captures the moment.

Here is a transcript of the swearing in.