The Hindu Laws of Manu advises a ruler to act so that “his subjects thrill with joy in him as human beings do at the sight of the full moon.” In ancient times a king secured justice with the help of a divine Rod of Punishment. “Properly wielded,” the text explains, the rod “makes all the subjects happy; but inflicted without due consideration, it destroys everything.”

“Even if WDW [Walt Disney World] is the HPOE [Happiest Place on Earth], it is still part of Earth,” legal scholar Lauren A. Newell wrote in a 2012 paper. “Occupants of WDW are not immune from inclement weather, technical malfunctions, hunger, fatigue, or any other source of unpleasantness that exists in life.”

In his Lives of the Eminent Philosophers, Diogenes Laërtius tells of Socrates’ disciple Aristippus, who “derived pleasure from what was present, and did not toil to procure the enjoyment of something not present.” Such opportunism was not widely admired; Aristippus was sometimes called “the king’s poodle.”

“One enterprising seventeenth-century systematizer,” noted classicist Mary Beard in a discussion of the different ways the sounds of laughter have been recorded throughout history, “attempted to classify the variants in these sounds and relate them to the different temperaments, hi hi hi indicating melancholics, he he he cholerics, ha ha ha phlegmatics, and ho ho ho hotheads.”

A late nineteenth-century concern for the nerve-racking speed of modern life prompted neurologist George Beard to introduce the term neurasthenia for a sickness whose symptoms include headaches, anxiety, impotence, insomnia, and lack of ambition. The condition was so prevalent in the United States that William James—who received the diagnosis along with his sister, Alice—referred to it as Americanitis.

“It was rejected because it was so simple and looked like too much fun,” Kurt Vonnegut wrote of his failed 1965 master’s thesis in anthropology, in which he argued that the plots of stories, when graphed, conform to a set of standard patterns. “The apathy of the University of Chicago is repulsive to me. They can take a flying fuck at the moooooooooooooooon.”

A 2018 study run at Buttercups Sanctuary in Kent, England, found that goats are sensitive to human emotions and strongly prefer to sniff smiling, happy faces rather than frowning ones.

President Herbert Hoover once praised a group of PR professionals. “You have taken over the job of creating desire,” he said, “and have transformed people into constantly moving happiness machines—machines which have become the key to economic progress.” It was 1928; the Great Depression began the following year.

A study of U.S. Supreme Court oral transcripts from 2004 to 2005 tabulated every instance the court reporter described a justice’s remarks provoking laughter. It found that Antonin Scalia had caused seventy-seven such episodes, while Clarence Thomas had caused zero.

Even before Jeremy Bentham wrote his own treatise on utilitarianism, Enlightenment scholars were attempting to quantify a happy life. In the eighteenth century, Glasgow professor Francis Hutcheson offered an equation for benevolence, defined as the desire to spread happiness to others, where b = benevolence, a = ability, s = self-love, i = interest, and m = moment of good. His formula: ba = m + sa = m + i, and therefore b = (m + i)/a.

Not long before his death in 961, Umayyad caliph Abd al-Rahman III testified that over his fifty years of reign, during which “riches and honors, power and pleasure, have waited on my call,” he had “diligently numbered the days of pure and genuine happiness.” Al-Rahman had counted only fourteen. “O man,” he lamented, “place not thy confidence in this present world!”

Maurice Sendak, author of classic picture book Where the Wild Things Are, claimed in a 2011 interview never to lie to children. “I refuse to cater to the bullshit of innocence,” he said. He was also in search of a “yummy death,” which he believed could be done “if you’re William Blake and totally crazy.” Two months later, less than a year before he died, Sendak returned to the topic. “I’m a happy old man,” he said. “But I will cry my way all the way to the grave.”

In 2016, Better Business World Wide hired “mystery shopping providers” to evaluate customer service around the world. The results were compiled in a Smiling Report, which found that Ireland scored the highest: 100 percent of customers received a smile. Shoppers in both Spain and Switzerland were greeted with a smile 97 percent of the time, while the lowest score was recorded in Hong Kong, where smiles occurred in only 48 percent of customer interactions.

“Swallowing sunshine is not at all difficult, and it works miracles of power, but some people are too lazy to do it,” wrote Unitarian Universalist clergyman Alden Eugene Bartlett in a 1918 guide to happiness. He advised, however, against swallowing too quickly. “If you have only been existing, half-dead,” he warned, “you will purify your blood so fast it will make you dizzy.”

Misfortune can cause a person unhappiness only when vice has already corrupted them, argued first-century Greek essayist Plutarch. “As a thread saws through the bone that has been soaked in ashes and vinegar, and as men bend and fashion ivory when it has been made soft and pliable by beer,” he wrote in a short piece collected in his Moralia, “so fortune, falling upon that which is of itself ill-affected and soft as the result of vice, gouges it out and injures it.”