Describing phalanx warfare, Thucydides wrote that “fear makes every man want to do his best to find protection for his unarmed side in the shield of the man next to him on the right.” The soldier farthest right must try to “keep his own unarmed side away from the enemy, and his fear spreads to the others who follow his example.” The effect of this fear, wrote the historian: “the right wing tends to get unduly extended.”

As a youth, the writer V.S. Naipaul struggled with hysteria. He described watching the film The African Queen while at Oxford: “Just when Bogart said something to Katharine Hepburn about sleeping one off or something, I could take it no longer and left the cinema. What form did it take? One was terrified of human beings. One didn’t wish to show oneself to them.” Naipaul claimed he cured himself over a two-year period. “Intellect and will,” he said, “intellect and will.”

Franklin Delano Roosevelt, who gave thirty so-called fireside chats over twelve years, was afraid of fire and refused to lock his door while sleeping so as to ensure easy escape, which he would often practice by dropping quickly from his bed or chair and crawling to the exit.

A surgeon in the British navy published an 1816 treatise on “The Incubus, or Nightmare, Disturbed Sleep, Terrific Dreams, and Nocturnal Visions,” arguing against folk beliefs that nightmares resulted from overindulgence and sleeping on one’s back. Sufferers “can bear testimony to the distress and alarm,” he wrote, “in many cases rendering the approach of night a cause of terror, and life itself miserable.”

Engineers at the University of Illinois published a paper in 1960 predicting doomsday would occur November 13, 2026, based on calculations of human-population growth; they hoped “some time, somehow, something will happen that will stop this ever-faster race to self-destruction.” One idea was space travel. “It is only unfortunate,” they wrote, “that no reentry permit to earth can be given to these space trotters.”

On Halloween 1981, a Los Angeles punk band called Fear was the musical guest on Saturday Night Live. Comedian John Belushi, who had invited Fear to play, brought in punks to watch the performance. Chaos ensued; SNL’s stage manager was hit in the chest with a pumpkin. “The real audience at Saturday Night Live was scared to death,” Fear’s lead singer later said. The band was banned from appearing again.

“One of the wonders of the human heart,” wrote twelfth-century poet Usama ibn Munqidh, “is that a man may face certain death and embark on every danger without his heart quailing from it, and yet he may take fright from something that even boys and women do not fear.” He relates the story of a battle hero his father knew who “would run out fleeing” if he saw a snake, “saying to his wife, ‘The snake’s all yours!’ And she would have to get up to kill it.”

Plato’s uncle Charmides boasted to wealthy aristocrat Callias that poverty granted freedom. “I lose nothing because I have nothing,” he said. Callias was unconvinced. “So, do you also pray never to be rich,” he asked, “and if you have a good dream, do you sacrifice to the averters of disaster?” “Not at all,” Charmides replied, “I accept the outcome like a daredevil.”