In the movie "Sliding Doors", the film splits into two parallel universes: one in which the main character, Helen, was not able to catch the train; and one in which she caught the train. The film tells about the life of Helen by alternating between these two universes, showing the outcomes of her life depending on whether she caught the train or not.

If Helen did not catch the train, she would not have talked to James and she would have had to take a taxi which lead her to getting robbed and injuring her head, additionally, due to this she got home late and was not able to catch her boyfriend, Gerry, with another woman; on the other hand, if she had caught the train, she would not have gotten a head injury, which could have had insidious effects,