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"What If—" is a fantasy short story by American writer Isaac Asimov, first published in the Summer 1952 issue of Fantastic and reprinted in the 1969 collection Nightfall and Other Stories. The story was inspired by the author's wife who, during a car journey they were taking from New York to Boston, asked him where he got his story ideas. Before they arrived, Isaac had thought of a plot based on the journey.
A married couple is traveling on a train from Boston to New York City. They meet a mysterious silent man known only as Mister If, who shows them a small portable television-like device about 6 by 9 inches (15 cm × 23 cm) in size. (Mr. If's first name is implied to be What, but whether this is true or not is left to the reader.)
On the device's screen, Mr. If shows the couple scenes from their earlier lives and what might have happened if certain minor but pivotal events had not occurred.
Eventually they learned that even if the pivotal event wouldn't occur, the result would eventually be the same.
Similar devices in subsequent fictionEdit
The story's theme and idea has been used in two episodes of the animated television series Futurama: "Anthology of Interest" and "Anthology of Interest II". Professor Farnsworth demonstrates a 'What If—' machine similar to Mr. If's.
Neil Gaiman wrote a short story called "The Wedding Present" as introduction for the collection "Smoke and Mirrors". In this story, a couple receives as a wedding present a stack of paper sheets relating what could have happened during their to-come life in common.
The 1998 British-American romantic comedy-drama film Sliding Doors is based on a similar idea. The film alternates between two parallel universes, based on the two paths the central character's life could take depending on whether or not she catches a train, and causing different outcomes in her life.
- Asimov, I. (1979) In Memory Yet Green, (Avon 1980 edition), pp. 611–612