Even though the concept had appeared once before, in the book "The Sound of Thunder".
"The Sound of Thunder" describes the journey of a hunter named Eckels back in time, to kill the almighty Tyrannosaurus Rex. He was told not to disturb anything in the past or else he would change the future.
The encounter with the King of Dinosaurs was chaotic. He almost hadn't made it back to the present. But when he did everything had changed.
He didn't do anything wrong. Did he?
Alas the encounter with the King was chaotic. His boot had gotten stuck in the mud as he stumbled off the path they were meant to take. Such a mistake can have dire consequences, can it?
Underneath that muddy boot.
Was a crushed Butterfly.
According to the Chaos Theory, a slight flutter of a Butterfly's wing could be the cause of a violent Typhoon weeks later.
In "The Sound of Thunder" a crushed Butterfly rewrote the future.
I am that Butterfly.