Chinese President Xi Jinping is rarely seen laughing — but new White House photos have captured just that. During a bilateral meeting with US President Donald Trump at the APEC summit in Busan, Xi was photographed grinning widely as Trump showed him a mysterious piece of paper. The moment stunned observers, as Xi's image in China is tightly controlled and rarely casual. Days later, Xi was again seen laughing with South Korea's President Lee Jae-myung after joking about "backdoors" in Chinese phones. These rare glimpses of humour reveal a surprisingly human side of China's most guarded leader. But what really made Xi laugh?
