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Goodreads asked Tamim Ansary:

Can you tell us a two-sentence horror story?

Tamim Ansary Here's one I didn't make up up but I remember from my childhood"
"The last surviving human locked himself into the room. Suddenly, there was a knock on the door."

And here's what popped into my head the moment I read this question:
"The clown laughed and laughed and laughed. Then it stopped laughing."

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