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Something weird happened at the end of President Obama's historic press conference with Cuban President Raul Castro.

The leaders had just made history with a press conference that touched on Guantanamo Bay and political prisoners.

As the two leaders went in for a handshake, the Cuban leader grabbed the president by the arm and hoisted it up, boxing referee style.

But the president didn't fully cooperate and flopped his wrist.

Speculation varied on social media about cause for the president's sudden limpness, but there's one thing people seem to agree on: It was extremely awkward. 

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