Picture: Photo by Rick Kern/Getty Images for Ford Motor Company
Although the event had a serious message it was clearly a relaxed affair, which was encapsulated in a moment of humour between Bush and Obama.
As Bill Clinton made his speech, where he highlighted the importance of rebuilding the territories decimated by high winds and tides in the Caribbean, Bush leaned over and whispered something to Obama.
Whatever it was must have been hilarious as neither man could hold back their grins or laughter. It sounds like Clinton almost cracked up too.
Predictably, the moment went viral on social media.
We're yet to come up with a concrete theory about what they were chuckling about, but Trevor Noah of The Daily Show has probably come up with some controversial ideas:
Tonight at 11/10c, what did President Bush say to give President Obama the giggles? https://t.co/sAZzfcW3C9