World leaders were taking a boat tour as part of cultural activities laid on by the Chinese government
The G20 in Hangzhou has been intricately planned and executed with daunting efficiency. But even the Chinese government, with its legion of officials, could not avoid the subversive act of a fish.
It happened when they least expected it. During a relaxing boat tour on a lake, supposed to give world leaders a chance to kick back, enjoy a meal, a drink and each other's company.
Theresa May was on one of two boats and had been chatting happily with Angela Merkel and Australian Prime Minister Malcolm Turnbull when nature struck. The victim was Mrs May's respected Italian counterpart, Matteo Renzi.
Reports suggest that as the leaders mingled, a fish made a death-leap from the deep, straight into their boat, causing a furore as prime ministers and presidents tried to avoid getting their evening-wear covered in lake water.
Mr Renzi, however, stepped forward. Perhaps it's not surprising given his nickname “Il Rottamatore”, meaning “the scrapper”.
The Independent understands that Renzi may have tried to usher the fish back into the lake with his foot, but in an act of sublime irony ended up taking a tumble on the deck himself.