The challenge for this week is "Favorite Poems, Short Stories, or Novellas".
I would be absolutely remiss if I did not start with the Murderbot novellas (and now one novel), but beyond that I'm... actually kind of at a loss. I don't read a lot of novellas. I also don't read a lot of poetry. (I feel like I should, but I didn't get much introduction to it until I got to college, and I just never really picked it up.)
So that leaves us looking at short stories, and I can name a few of those:
Doctor Diablo Goes Through the Motions, by Saladin Ahmed. A disgruntled supervillain ponders the nature of villainy. (The rest of the collection is entirely worthwhile too, but that's the one that stuck out to me.)
Wikihistory, by Desmond Warzel. A look at the message boards for the International Association of Time Travelers.
Stephen King's short stories were formative for me (I read a lot of horror when I was around 12-14), as were Roger Zelazny's. (Unfortunately, Zelazny died before e-books really took off, so his works can be kind of expensive. They're starting to show up as ebooks, though, finally. Some of them, anyway.)
And those are the ones that stick in my head, though I'm sure I'm forgetting some others. What are yours?