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The quantum-mechanical "Schrödinger's cat" paradox. In this interpretation, every event is a branch point. A cat is placed in a closed box and left there for multiple days. Until checked, the cat is both alive and dead—regardless of whether the box is opened—but the "alive" and "dead" cats are in different branches of the universe that are equally real but cannot interact with each other. By opening the box, the cat will be dead. If you never open the box, the cat is alive.
Or, Babe drives a motorcycle into a tree, and the repercussions are stronger than they're supposed to be.