The Fox Sisters — the rappings that founded a religion were made by cracking toes

On 31 March 1848, in a small rented farmhouse in Hydesville, New York, two sisters — eleven-year-old Kate Fox and her fourteen-year-old sister Margaret, called Maggie — began producing mysterious raps that seemed to answer questions, claiming an unseen presence was knocking back. There was no presence. Forty years later, on 21 October 1888, before a paying audience of some two thousand at the New York Academy of Music, Margaret Fox stood up and confessed: the raps had always been a trick, made by snapping the joints of her toes and ankles, a habit the girls had begun as a prank on their mother and never stopped. She demonstrated the sound on stage, her bare foot on a small wooden stool, while doctors on the platform confirmed the noise came from her toes.

Between those two dates the Fox sisters had founded modern Spiritualism, one of the largest religious movements of the nineteenth century. What began as two children fooling a credulous adult grew, under the management of their much older sister Leah, into a national sensation: public demonstrations, paid séances, and a doctrine that the living could converse with the dead through rapping mediums. The movement spread through the United States and Europe and, by the 1880s, was credited by its own adherents with millions of believers, swelled enormously by the grief of the American Civil War, which left countless families desperate to reach the sons they had lost.

The confession was as public as the hoax had been, and it was bought. The New York World reportedly paid Margaret around 1,500 dollars for the exclusive, and she denounced Spiritualism from the stage as a fraud she had helped create. Yet the recantation did not stick. Within roughly a year, impoverished and pressured, Margaret took her confession back, and many Spiritualists simply refused to believe she had ever told the truth. Both sisters died soon after in poverty and ill health — Kate in 1892, Margaret in 1893 — and the movement they had launched carried on without them.

The Fox case is a defining specimen hoax not because the trick was clever but because it was so trivial and yet scaled so far. Two girls cracking their toes produced a phenomenon that drew in judges, editors, scientists, and a future Sherlock Holmes author, and that hardened into a faith resilient enough to survive its own founder’s confession. The mechanism of the deception was a parlour prank; the mechanism of the credulity was grief, showmanship, and the human refusal to let the dead stay silent.