What did Donald Trump do today?

He got laughed at by world leaders.

Addressing the United Nations General Assembly today, Trump slipped into campaign rhetoric. He told the assembled world leaders and delegates that "In less than two years, my administration has accomplished more than almost any administration in the history of our country."

The crowd laughed loudly enough to interrupt Trump's next line, and then laughed louder after he insisted, "So true!"

Trump recovered reasonably well, smiling and saying, "I didn't expect that reaction, but that's okay." But within a few hours, the video of an American president being openly laughed at during a major world address had gone viral. 

Trump changed his story then, insisting to reporters that he was expecting that reaction because he had been deliberately trying to put a laugh line in an otherwise serious address to the U.N. General Assembly. But his own mood had visibly darkened by then.

So what?

• The United States' position in the world depends on the rest of the world respecting the president enough to not laugh in his face.

• Complete inability to admit even small mistakes is not a sign of good mental health.

• Neither is an inability to keep from telling self-serving lies, even when they are obvious.