Time Safari, Inc. offers rich people a chance to travel 65 million years into the past to kill – not hunt – dinosaurs already predestined to die at the same place and time. As long as the merry band of time travelers remains on a path resembling transparent liquid metal that hovers above the terrain and do not interfere with the environment in any way, history and evolution as we know it are still preserved. Of course, the rigid controls supposed to be in effect are futile against a cowardly inept rich snob who carelessly stomps on a butterfly. The Butterfly Effect is, of course, the theory that maintains that a butterfly's wings flapping on one side of the earth could eventually cause a hurricane thousands of miles away. In the movie, the effect causes ripples in time.