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

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:

11 PHOTOS
Twitter reacts after Bush makes Obama crack up at historic meeting
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Twitter reacts after Bush makes Obama crack up at historic meeting
Five former U.S. presidents, Jimmy Carter, George H.W. Bush, Barack Obama, George W. Bush and Bill Clinton, speak during a concert at Texas A&M University benefiting hurricane relief efforts in College Station, Texas, U.S., October 21, 2017. REUTERS/Richard Carson TPX IMAGES OF THE DAY
Bush's reaction after he gets Obama to laugh at his joke is the ultimate post dad joke face https://t.co/lH7o3EuMCw
Bush cracking a joke to Obama during Clinton's speech. Man is a legend @ComfortablySmug https://t.co/O7UtwbW1Yo
A gif of Bush telling Obama a joke while Clinton is speaking is something I never knew I needed in my life until now https://t.co/sMVHB3217B
A gif of Bush telling Obama a joke while Clinton is speaking is something I never knew I needed in my life until now https://t.co/sMVHB3217B
Watching George W. Bush making Obama laugh while Clinton speaks is a great way to end your Sunday https://t.co/Jn94lhkX2L
#GeorgeWBush whispering a joke to #Obama that causes them 2 break composure during @BillClinton's speech is pretty… https://t.co/fyAC0NQpbo
I need to know what George W. Bush whispered to Barack Obama to make him laugh during Bill Clinton’s speech https://t.co/sm2lIVgwX8
W cracking a joke to Obama while Clinton gives a speech is me in middle school https://t.co/Sw6uQwXRcf
Bush pulling a dad move, cracking a joke to Obama during Clinton's speech, and glancing repeatedly to see his react… https://t.co/wyNBOpuPVP
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This was the first time all five living former presidents appeared together since 2013.

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