It was perhaps only a matter of time before US President Donald Trump's brasher instincts smashed through the ring of decorum that had held fast on his gaffe-free first day in Japan.
The victims: the colorful, and much loved, koi carp of Akasaka palace in Tokyo.
After a breakfast meeting, Trump chastised his hosts for unfair trade practices before an audience of Japanese and US business leaders.
Then came a meeting with the imperial couple, with all the potential for a slip-up that holds.
Trump nodded and smiled as he shook hands with Emperor Akihito and Empress Michiko, but avoided the deep bow that landed Barack Obama in hot water during his first trip to Japan as president in 2009.
As it turned out, the only person who could have felt slighted was Melania Trump, who was still getting out of their armored car - The Beast - while her husband made small talk with his hosts at the entrance to the imperial palace.
It was not the first time Trump has left the first lady behind, and may explain why she did not break into a smile until the party moved to a reception room for a chat that, as protocol dictates, was out of earshot of reporters.
But the misstep of the trip so far came in the unlikely setting of a pond in the palace grounds, home to a large collection of koi carp that have been viewed by a succession of world leaders, including Margaret Thatcher.
Presumably, the former British prime minister was less aggressive than Trump when it came to feeding the pond's inhabitants.
Having apparently lost patience with tempting the fish to the edge with modest offerings of food, Trump simply upended his wooden container and dumped its entire contents into the water.
White House reporters captured the moment on their smartphones and tweeted evidence of the president's questionable grasp of fish keeping.
Abe was seen grinning, as was a woman in a kimono standing to one side. Next to her, Rex Tillerson - perhaps grateful for a moment of comic relief after he was named in the Paradise Papers - could not suppress a laugh, according to witnesses.
Some speculated that a poor palace employee would be dispatched to the scene of Trump's faux pas to clean up the mess as soon as the two leaders disappeared inside.
Source: News Agencies, Edited by website team