George W. Bush walked past Donald Trump and gave Barack Obama a tap on the belly as he arrived at his seat for Jimmy Carter’s funeral service on Thursday. A two-second video of the interaction between the former presidents went viral,

Donald Trump and Barack Obama sat next two each other and chatted during the funeral service for former President Jimmy Carter at Washington's National Cathedral. Trump engaged Obama for several minutes before the start of the funeral.

Former President George W. Bush's casual greeting of former President Barack Obama at Jimmy Carter's state funeral is going viral online. Obama was seated next to President-elect Donald Trump and his wife,

The former president and once-again-future president, who are historically something less than besties, chatted it up before the service began. (Michelle Obama was not in attendance.)

Donald Trump shook hands with Mike Pence at Jimmy Carter's state funeral -- a notable exchange as the two men have not interacted publicly in years.

Trump is obviously no fan of Biden, but Obama and his veep also have a famously complex relationship, only made more so after Obama helped nudge Biden to quit the presidential race last summer. Surely Obama feels some frustration that Biden fumbled a possibly winnable race; maybe he couldn’t help spill to his sworn enemy?