A guy goes to the doctor. 'Doctor, I keep thinking I'm a moth.' Doctor says, 'I think you need a psychiatrist, not a doctor.' Guy says, 'Yes, I know.' Doctor asks, 'So why did you come here?' Guy replies, 'Well, your light was on.'
Well, a very very very short story could be something like 'The cat jumped. It landed. End.' It's extremely concise and gets to the point quickly without much elaboration.
The characteristics of a very very very short story include simplicity. It doesn't have complex plotlines or numerous characters. For example, 'Bird flew. Sky was blue.' Also, it can be highly suggestive. Since it's so short, it makes the reader think more. Like 'Light went out. Silence.' It makes you wonder why the light went out and what the silence means. These stories are often about capturing a moment or a basic human experience in the most minimal way.
Once upon a Christmas, a little boy found a lost reindeer in the forest. He took it home, fed it, and on Christmas Eve, it flew back to Santa, leaving a small gift for the boy.