My sweetheart and I play a game. One of us makes up a sentence and then the other one invents a short story that begins with that sentence.
Sometimes the stories hit dead-ends. Other times they wind on for a long while. This is a good game for when you’re traveling, but can be quite difficult if you have to focus on something else. Also, it’s sometimes difficult to remember the names and other details you’ve put in at the beginning as the story gets longer.
Perhaps I ought to try it with my computer handy and see what turns up.