Hillary Clinton and Barack Obama were cracking each other up backstage last night

While everyone's eyes were glued to the Democratic National Convention's stage last night, Hillary Clinton and President Obama were practically falling out of their seats laughing backstage. In a private moment between the president and the Democratic presidential nominee Wednesday night, something so funny was said that Obama literally doubled over chuckling:

While only Obama and Clinton seemed to be in on this particular joke, there were a lot more interactions going on behind the scenes.

Vice President Joe Biden, for one, gave lots of hugs:

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Vice presidential nominee Tim Kaine practiced his speech:

And Obama and former President Bill Clinton had a good long talk:

Now, if only we knew what that joke was.