May 23, 1926, H. L. Mencken’s newspaper column confessed his hoax of nine years earlier — he had made up whole cloth the story of Millard Fillmore’s only accomplishment being the installation of a plumbed bathtub in the White House (in the 1850s known as the Executive Mansion).
Alas, the hoax cat was out of the bag, and the hoax information still pollutes the pool of history today.
Text of the confession, from the Museum of Hoaxes:
Melancholy Reflections
On Dec. 28, 1917, I printed in the New York Evening Mail, a paper now extinct, an article purporting to give the history of the bathtub. This article, I may say at once, was a tissue of absurdities, all of them deliberate and most of them obvious…
This article, as I say, was planned as a piece of spoofing to relieve the strain of war days, and I confess that I regarded it, when it came out, with considerable satisfaction. It was reprinted by various great organs of the enlightenment, and after a while the usual letters began to reach me from readers. Then, suddenly, my satisfaction turned to consternation. For these readers, it appeared, all took my idle jocosities with complete seriousness. Some of them, of antiquarian tastes, asked for further light on this or that phase of the subject. Others actually offered me corroboration!
But the worst was to come. Pretty soon I began to encounter my preposterous “facts” in the writings of other men. They began to be used by chiropractors and other such quacks as evidence of the stupidity of medical men. They began to be cited by medical men as proof of the progress of public hygiene. They got into learned journals. They were alluded to on the floor of congress. They crossed the ocean, and were discussed solemnly in England and on the continent. Finally, I began to find them in standard works of reference. Today, I believe, they are accepted as gospel everywhere on earth. To question them becomes as hazardous as to question the Norman invasion.
* * *
And as rare. This is the first time, indeed, that they have ever been questioned, and I confess at once that even I myself, their author, feel a certain hesitancy about doing it. Once more, I suppose, I’ll be accused of taking the wrong side for the mere pleasure of standing in opposition. The Cincinnati boomers, who have made much of the boast that the bathtub industry, now running to $200,000,000 a year, was started in their town, will charge me with spreading lies against them. The chiropractors will damn me for blowing up their ammunition. The medical gents, having swallowed my quackery, will now denounce me as a quack for exposing them. And in the end, no doubt, the thing will simmer down to a general feeling that I have once more committed some vague and sinister crime against the United States, and there will be a renewal of the demand that I be deported to Russia.
I recite this history, not because it is singular, but because it is typical. It is out of just such frauds, I believe, that most of the so-called knowledge of humanity flows. What begins as a guess — or, perhaps, not infrequently, as a downright and deliberate lie — ends as a fact and is embalmed in the history books. One recalls the gaudy days of 1914-1918. How much that was then devoured by the newspaper readers of the world was actually true? Probably not 1 per cent. Ever since the war ended learned and laborious men have been at work examining and exposing its fictions. But every one of these fictions retains full faith and credit today. To question even the most palpably absurd of them, in most parts of the United States, is to invite denunciation as a bolshevik.
So with all other wars. For example, the revolution. For years past American historians have been investigating the orthodox legends. Almost all of them turn out to be blowsy nonsense. Yet they remain in the school history books and every effort to get them out causes a dreadful row, and those who make it are accused of all sorts of treasons and spoils. The truth, indeed, is something that mankind, for some mysterious reason, instinctively dislikes. Every man who tries to tell it is unpopular, and even when, by the sheer strength of his case, he prevails, he is put down as a scoundrel.
* * *
As a practicing journalist for many years, I have often had close contact with history in the making. I can recall no time or place when what actually occurred was afterward generally known and believed. Sometimes a part of the truth got out, but never all. And what actually got out was seldom clearly understood. Consider, for example, the legends that follow every national convention. A thousand newspaper correspondents are on the scene, all of them theoretically competent to see accurately and report honestly, but it is seldom that two of them agree perfectly, and after a month after the convention adjourns the accepted version of what occurred usually differs from the accounts of all of them.
I point to the Republican convention of 1920, which nominated the eminent and lamented Harding. A week after the delegates adjourned the whole country believed that Harding had been put through by Col. George Harvey: Harvey himself admitted it. Then other claimants to the honor arose, and after a year or two it was generally held that the trick had been turned by the distinguished Harry M. Daugherty, by that time a salient light of the Harding cabinet. The story began to acquire corroborative detail. Delegates and correspondents began to remember things that they had not noticed on the spot. What the orthodox tale is today with Daugherty in eclipse, I don’t know, but you may be sure that it is full of mysterious intrigue and bold adventure.
What are the facts? The facts are that Harvey had little more to do with the nomination of Harding than I did, and that Daugherty was immensely surprised when good Warren won. The nomination was really due to the intense heat, and to that alone. The delegates, torn by the savage three cornered fight between Lowden, Johnson, and Wood, came to Saturday morning in despair. The temperature in the convention hall was at least 120 degrees. They were eager to get home. When it became apparent that the leaders could not break the deadlock they ran amuck and nominated Harding, as the one aspirant who had no enemies. If any individual managed the business it was not Harvey or Daugherty, but Myron T. Herrick. But so far as I know Herrick’s hand in it has never been mentioned.
* * *
I turn to a more pleasant field — that of sport in the grand manner. On July 2, 1921, in the great bowl at Jersey City, the Hon. Jack Dempsey met M. Carpentier, the gallant frog. The sympathy of the crowd was overwhelmingly with M. Carpentier and every time he struck a blow he got a round of applause, even if it didn’t land. I had an excellent seat, very near the ring, and saw every move of the two men. From the first moment Dr. Dempsey had it all his own way. He could have knocked out M. Carpentier in the first half of the first round. After that first half he simply waited his chance to do it politely and humanely.
Yet certain great newspapers reported the next morning that M. Carpentier had delivered an appalling wallop in the second round and that Dr. Dempsey had narrowly escaped going out. Others told the truth, but what chance had the truth against that romantic lie? It is believed in to this day by at least 99.99 per cent of all the boxing fans in Christendom. Carpentier himself, when he recovered from his beating, admitted categorically that it was nonsense, but even Carpentier could make no headway against the almost universal human tendency to cherish what is not true. A thousand years hence schoolboys will be taught that the frog had Dempsey going. It may become in time a religious dogma, like the doctrine that Jonah swallowed the whale. Scoffers who doubt it will be damned to hell.
The moral, if any, I leave to psycho-pathologists, if competent ones can be found. All I care to do today is to reiterate, in the most solemn and awful terms, that my history of the bathtub, printed on Dec. 28, 1917, was pure buncombe. If there were any facts in it they got there accidentally and against my design. But today the tale is in the encyclopedias. History, said a great American soothsayer, is bunk.
Posted by Ed Darrell 
Millard Fillmore's Bathtub 