Barack Obama couldn't stop laughing after George W. Bush whispered in his ear

Aris Folley, AOL.com

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All five living former U.S. presidents gathered at a hurricane relief concert in Texas to raise money for victims of Hurricane Harvey, Irma, and Maria on Saturday night -- and the Internet can't stop obsessing about one moment between George W. Bush and Barack Obama.

During his time in office, Obama was known for his composure and, at times, even disposition. But over the weekend, the former president completely lost it at the relief event hosted by One America Appeal.

You can view the moment at the 3:35 mark.

While Bill Clinton delivered a speech discussing the enduring disaster in Puerto Rico, the younger Bush smiled and appeared to whisper something to Obama, making him laugh behind Bill Clinton.

SEE ALSO: Trump video played at hurricane relief concert

The giggly moment has since gone viral, with many users online tweeting about how much they enjoyed watching the two bond. 

"W cracking a joke to Obama while Clinton gives a speech is me in middle school," one user wrote, while another added, "Bush pulling a dad move, cracking a joke to Obama during Clinton's speech, and glancing repeatedly to see his reaction." 

Click through more reactions below:

This was the first time all five living former presidents appeared together since 2013.