Speed Freaks

Butterfly effect: The scientific theory that a single occurence, no matter how small, can change the course of the universe forever.A father and son diving off the coast of Hawaii, with the sharks closing in. A scientist in a forest under attack from a savage bear. A young girl who has been kidnapped by drug dealers in Rio. The teenagers surfing on top of a speeding bullet train.For them, and many others, things will never be the same again.