With an arbitrary short story, you get supplied with the bare bones of a plot to which you then add the details. I love doing this in large groups and seeing all the variations that emerge from the different imaginations. Here's one we did in class last week...
Read 1, and write a paragraph. Then read 2, and write another paragraph following that direction, then 3 and so on.
1. Someone is on their way somewhere.
2. A form of transport goes by - they get on.
3. They see someone - describe this person.
4. They find something in their pocket.
5. It makes them remember something.
6. They reach their destination.
7. They change their mind about what to do next.
All story telling is about going from A to B to C to D, what matters is how we write the journey.