On the TV shows I watch I love the "What If" episodes ... where things are in "Alternative Universes" etc.
One of the classic films showing that is
Sliding Doors - Helen (played by Gwyweth Paltrow) is fired from her job at a PR company, and when the sliding doors of the tube car close on her, we start to see what would have happened if she'd made the train, and if she hadn't.
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