The Labour leader is in trouble for wearing a jacket and trousers that didn't match to the Battle of Britain service at St Paul's yesterday. Not only that, but the top button of his shirt was undone and his red tie was not knotted right to the neck.
Oh yes, and he didn't sing the National Anthem.
These are the things you need to know about Jeremy Corbyn's activities yesterday.
He also made a speech to the Trades Union Congress, but for today's newspapers, that was almost insignificant when set against his monumental sins earlier in the day.
Did anybody in the real world care? Will the non-singing of a song cost Labour a single vote? Or gain one?
Damned if he did, damned if he didn't.
Honouring those who served the country at war is a tricky business for Labour leaders. Consider the flak Michael Foot took over his choice of coat for the Cenotaph in 1983. How dare he pick something warm from his wardrobe instead of trotting off to Aquascutum for a classic number in navy serge?
If Corbyn's attire and attitude were disrespectful to Queen and country, how disrespectful to the country were this morning's newspapers? "You don't need to know about his policies, take it from us they're laughable. So rather than report what he had to say, we'll just mock the way he said it and concentrate on his bad manners."
The Times splash did at least give a fair chunk to the TUC speech, even though the intro and heading were anthem-related and the overall emphasis - as with the Independent - was on a "day of chaos". The Express gave the address a page lead a few pages behind the St Paul's scandal, albeit in "look what he's come up with now" style; the Mail reported it straight in a box on its "Labour Earthquake spread" - and then gave Quentin Letts four columns to lampoon the delivery.
This, however, was the entirety of the Telegraph's reporting of what its splash described as "the first major speech of his tenure":
Mr Corbyn yesterday travelled to the TUC conference in Brighton where he delivered a rambling speech that called for people to be given unlimited benefits. Just before he took to the stage, the string quartet played a rendition of Hey Big Spender, an apparent reference to his "people's quantative easing" policy.
Mr Corbyn also said the unions would write his manifesto for the next general election, and compared the Government to the fascist leadership of General Franco in Spain.
Corbyn's campaign and election bypassed the conventional relationship between politicians and the media and thus enhanced the sense of there being something fresh about him.
There was much Twitter joy over the fact that an aide had put the phone down on The Sun's Harry Cole, but how wise it is to refuse to communicate with the country's biggest selling paper remains to be seen.
Corbyn's win may have been a landslide, but it still came from just a quarter of a million votes from politically engaged people. The Sun is seen by 24 times as many people every day and, much as Corbyn and his deputy Tom Watson may wish to declare war on Murdoch, it would be folly to ignore such a huge constituency if they hope to attain power.
They cannot expect to speak to packed halls week in, week out. Social media are just echo chambers where people follow or interact with like-minded souls and jeer at those with a different outlook. As several commentators, including those on the Left, point out today, Corbyn needs to get to grips with the mainstream media. Shunning Andrew Marr and the Sun is not a strategy that will lead to electoral success.
Now let's see what the rest of them make of Prime Minister's Questions.