I had a splinter in my thumb I suspected was a piece of glass. When did I get that? Where did it come from? How long had it been there? For some reason, I imagined a character in a story with the same problem.
What if she were in the kitchen when she discovered the sliver? What if her husband were in the room and she remembers the glass was an animal from a menagerie she didn’t own? They argued. The small dolphin or cat or bear crashed to the floor. Afterward she cleaned it up.
Then a mess of conflict happens.
And finally the last line comes. What would that be? How would things resolve? What if, after the story is presented and after some wow factor, the reader is brought to the present where the characters are in the kitchen. The woman asks for a pair of tweezers only to look up to find her husband is gone. Really gone. The end.
Consider this an invitation to construct the first and last sentences (or paragraphs) to a story and see how well it works as a writing prompt for you!