Re: Last Post Wins
I think it would be something that creates an eerie or perhaps somewhat otherworldly mood and makes one contemplate on larger issues or just odd, perhaps unexplainable events.
In which case there are probably a ton of novellas and anthologies around (might I suggest "Tlön uqbar orbis tertius" by Argentinian writer Jorge Borges, or "The last question" by the famous Isaac Asimov, both of which are thought-provoking and fairly short reads).