Main plot types are numbered; subspecies and variants receive letters.
Of course it's not impossible to write a good story with one of these plots or themes; it's not that these are inherently bad plots, merely that we see too many stories that use them.
- Person is (metaphorically) at point A, wants to be at point B. Looks at point B, says "I want to be at point B." Walks to point B, encountering no meaningful obstacles or difficulties. The end. (A.k.a. the linear plot.)
- Creative person is having trouble creating.
- Writer has writer's block.
- Painter can't seem to paint anything good.
- Sculptor can't seem to sculpt anything good.
- Creative person's work is reviled by critics who don't understand how brilliant it is.
- Creative person meets a muse (either one of the nine classical Muses or a more individual muse) and interacts with them, usually by keeping them captive.
- New diplomat arrives on alien planet, ignores anthropologist's attempts to explain local rules, is punished.
- In the end, it turns out it was all a dream.
- In the end, it turns out it was all in virtual reality.
- In the end, it turns out the protagonist is insane.
- In the end, it turns out the protagonist is writing a novel and the events we've seen are part of the novel.
- An A.I. gets loose on the Net but the author doesn't have a clear concept of what it means for software to be "loose on the Net." (Hint: the Net is currently a collection of individual computers, not some kind of big ubercomputer; software doesn't currently run in the wires between computers.)
- In the future, all learning is electronic, until kid is exposed to ancient wisdom in the form of a book.
- In the future, everything is electronic, until kid is exposed to ancient wisdom in the form of a wise old person who's lived a non-electronic life.
- Bad person is told they'll get the reward that they deserve, which ends up being something bad.
- Terrorists (especially Osama bin Laden) discover that horrible things happen to them in the afterlife (or otherwise get their comeuppance).
- Protagonist is portrayed as really awful, but that portrayal is merely a setup for the ending, in which they see the error of their ways and are redeemed.
- The characters are described as if they are humans, but in the end it turns out they're not humans.
- Creatures are described as "vermin" or "pests" or "monsters," but in the end it turns out they're humans.
- The author conceals some essential piece of information from the reader that would be obvious if the reader were present at the scene. (This can be done well, but rarely is.)
- Person is floating in a formless void; in the end, they're born.
- Person uses time travel to achieve some particular result, but in the end something unexpected happens that thwarts their plan.
- The main point of the story is for the author to metaphorically tell the reader, "Ha, ha, I tricked you! You thought one thing was going on, but it was really something else! You sure are dumb!"
- Someone calls technical support for a magical item.
- Someone calls technical support for a piece of advanced technology.
- The title of the story is 1-800-SOMETHING-CUTE.
- In the future, the punishment always fits the crime.
- In the future, the American constitutional amendment prohibiting cruel and unusual punishment has been repealed, or is interpreted very narrowly, or is just ignored by the author.
- A group of real-world humans who like roleplaying find themselves transported to D&D world.
- The alien is fluent in English and completely familiar with various English idioms, but is completely unfamiliar with human biology and/or with such concepts as sex or violence.
- The alien takes everything literally.
That's a lot of stock writing. Though a few of these seem too generic to condemn straight off as stock, I can imagine myself tearing my hair out over the nteenth story about D&D characters named something like Bolar Ironbowels or something tearing bodyparts and loot out of an orc. However, I would be glad to see someone like Farthana the Pregnant Cow (apologies to Gaurav and Annie) wandering around...