David Cameron was recently caught on broadcast camera calling Nigeria and Afghanistan "fantastically corrupt", telling the Queen that they were "possibly the two most corrupt countries in the world".
But this wasn't the first time the PM has experienced the danger of unguarded comments in the presence of TV microphones - nor was he the first politician to do so.
Here's a list of the most cringe-worthy comments made by politicians who've fallen into that particular trap.
1. David Cameron
Last year the PM was recorded talking about Yorkshire people "hating each other". He was also previously caught revealing how the Queen "purred" with pleasure when he told her Scots had rejected independence.
That controversial remark was picked up by broadcast microphones on a trip to New York soon after the 2014 referendum.
The former prime minister famously described a potential Labour voter as "a bigoted woman" in a spectacular gaffe.
His comments were unwittingly broadcast to the world during a campaign visit to Rochdale during the 2010 general election campaign.
3. John Major
The former Tory PM excelled himself in Tokyo once by announcing to what he wrongly assumed was a dead microphone that he regarded some of the Eurosceptic members of his Cabinet as "bastards" whom he would like to "crucify".
He added: "Even as an ex-whip I cannot stop people sleeping with other people that they ought not ..."
4. Ronald Reagan
Perhaps the most celebrated of all such gaffes was the former President's in 1984, when he said: "My fellow Americans. I am pleased to tell you I just signed legislation which outlaws Russia forever. The bombing begins in five minutes."
5. James Callaghan
When he was prime minister, Callaghan went into a radio studio in Leeds and, in a conversation with staff there, said: "What a nuisance and a waste of time it is to have to go into the House of Commons twice a week to answer questions."
6. Prince Charles
The Prince of Wales has also fallen for "live microphone syndrome" with his remarks about Nicholas Witchell, the BBC's royal correspondent.
He said: "Bloody people. I can't bear that man. I mean, he is so awful, he really is."
7. Kathleen Gingrich
The mother of Newt Gingrich, a prominent US Republican politician, inadvertently let slip her son's views about Hillary Clinton, who was then first lady of the United States.
"He thinks she's a bitch," she said.