The "butterfly effect" refers to major events of the future being changed by something as innocuous as stepping on a butterfly or, for the intro to this film, a butterfly flapping its wings. This comes from a 1952 Ray Bradbury story, The Sound of Thunder. In the story, a time traveler goes on safari to hunt dinosaurs. The animal is known to have been doomed to die within minutes by a tree fall, so his death won't matter, and they are suspended above the ground on a projected trail and wearing hazmat suits, but the man panics, falls off the trail and the hunt is over. Upon his return to the present, he finds that history has taken a disastrous turn. As he takes off his hazmat suit, he sees, embedded in the mud on his boots, a crushed prehistoric butterfly. The sound of thunder is his self-inflicted gun shot.

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