In the short time he has been president, US President Donald Trump's weird dealings with world leaders have become one of his trademarks.
He gripped Japanese Prime Minister Shinzo Abe's hand for an eye-watering 19 seconds, while seeming to ignore German Chancellor Angela Merkel's handshake invitation. And there was that huffy phone call with Malcolm Turnbull, where Mr Trump blew up about the "dumb" refugee deal Australia made with Barack Obama.
So how should Mr Turnbull prepare for his first face-to-face meeting with his US counterpart in New York next week?
Mike Green, a former US National Security Council staffer during George W Bush's presidency, says Mr Turnbull should start by watching the powerful right wing Fox News channel, to get a sense of "what's going into the President's head".
"[Trump] is not in command of the detail. Most of his information comes from watching Fox TV."
Dr Green, who is now senior vice-president for Asia at the Center for Strategic and International Studies in Washington DC, adds Mr Abe's February meeting with Mr Trump was successful because the Japanese leader focused on convincing the US President "Japan was his best friend".
"Every issue is a potential point of negotiating something," Dr Green explains. "If you ask for something, [Trump] sees that as a weakness."
Sydney University history professor and Lowy Institute non-resident fellow James Curran says it is likely Mr Turnbull will arrive in New York with something up his sleeve to offer Mr Trump. But Professor Curran predicts Mr Trump will not repeat his angry telephone performance, given the significant backlash and bad press in the US after the showdown.
"I suspect that this is going to be pretty straight up and down."
Changes in senior personnel since the January phone call also point to a steadier encounter between the two leaders. Lieutenant General HR McMaster has taken over from Michael Flynn as National Security Advisor, meaning decision making and briefing have become "much more predictable," Dr Green says.
Former Australian ambassador to the US, Kim Beazley, says Australia should be "well prepared" for the meeting. Mr Turnbull has had a year-and-a-half in office and would now have a "clear-cut definition" of Australia's interests and priorities. He adds Mr Turnbull's recent visit to Iraq and Afghanistan, where he reiterated Australia's "long-term commitment" to training local forces, would also be seen as a "good thing" in the eyes of the US.
With discussions set to focus on North Korea, Syria, Iraq and Afghanistan, Mr Beazley says he is hopeful the two leaders would not need to talk about the contentious refugee deal again.
But to anyone who thinks such meetings are usually a staid affair, high-level Australia-US catch ups are "never that scripted" in Mr Beazley's experience.
He says the publicly announced discussion points "never give you a real flavour" of what happens.
"We're actually very frank with each other."