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It's referred to as Chaos Theory or sometimes as "The Butterfly Effect". If that guy hadn't stopped to observe the butterfly, he would have been on time and everything would have been fine. The tiniest of events can have catastrophic consequences.
Steins;Gate would be pretty interesting anime for you zirusianna, it's about butterfly effect and shit.
also it's so cool sonuvabitch
I should stop saying this
Chaos Theory. It's a decent movie, if you like Ryan Reynold's acting and is a decent example of Chaos Theory at work (no science-y stuff with it, though).