In the 1951 movie Distant Drums starring Gary Cooper, a small band of soldiers are crossing a swamp in pursuit of Seminole Indians. While wading through the Everglades, one unnamed soldier is attacked and dragged underwater by an alligator. His last sound is an agonised, startled scream. Two years later in The Charge at Feather River, a soldier named Private Wilhelm screamed as he’s struck by an arrow in his leg. So began the cinematic legend that is the “Wilhelm Scream”, a sound effect that has punctuated a multitude of films over six decades.