Three Worlds Collide

""The kind of classic fifties-era first-contact story that Jonathan Swift might have written, if Jonathan Swift had had a background in game theory.""

- Peter Watts, "In Praise of Baby-Eating"

Three Worlds Collide is a web novella by Eliezer Yudkowsky of the semi-firm SF variety. As previously mentioned, it is a First Contact story - it deals with the ethics and tactics associated with meeting Starfish Aliens, among other things. To some extent it also reads like a thought experiment about game theory (it was, after all, written for a blog about human rationality). Has many allusions to modern Internet memes and current ideas in the transhumanism community.

Also, swearing, Naughty Tentacles, and other stuff which your boss might not like.

The story provides examples of:

 * Aesoptinum
 * Author Tract: Much of what transpires is an illustration of theories the author had previously posted to the same blog. See Harry Potter and The Methods of Rationality for another example.
 * Beauty Equals Goodness: Inverted and played straight. The Babyeaters are elegant crystalline things, yet they based their entire culture on the slow, painful consumption of their own sentient offspring. However, the even worse "Super-Happies" are utterly disturbing blobs of tentacle and colour.
 * Beware the Nice Ones: The wrath of the Superhappies is terrible indeed. Terrible and weird.
 * Blue and Orange Morality: The entire point of the story.
 * Boldly Coming: The Superhappies first-contact message ends with "Would you like to have sex?"
 * Deathbed Confession
 * Death Equals Redemption
 * Deliberate Values Dissonance: Future social mores aren't like present ones, much like present ones aren't like those of several hundred years in the past. A particular example is future humans' views on rape, which are so divorced from modern mores that the latter are incomprehensible to the protagonists even after being explained.
 * Earn Your Happy Ending: The author made the readers earn it.
 * Earthshattering Kaboom
 * Eats Babies: Subverted and inverted by the Babyeaters -- not only is the Eats Babies trope not used as a simple sign of being a Complete Monster, but in the Babyeater fiction, letting too many babies live is used as a simple sign of being a Complete Monster.
 * Esoteric Happy Ending: Deliberately invoked -- either or both endings could be considered this, depending on your values. According to the author, the ending that involves is the good one.
 * First Contact: A triangular example between Humans, Babyeaters, and Superhappies all at the same time. Justified by all three races having been attracted by an unusual cosmological phenomenon in the vicinity.
 * Gallows Humor: One of the main coping strategies of many characters in the last chapter.
 * Genetic Memory: Also sexually transmitted.
 * Getting Smilies Painted on Your Soul: What the Superhappies plan to do to the Babyeaters and humans.
 * Groin Attack: Played for humor.
 * Happily Ever After: The bad ending. For certain values of "happily".
 * Humans Through Alien Eyes
 * Info Dump: I've translated the aliens' language! But before telling you what they said, let me bring you up to speed on the history of statistical language-translation methods...
 * Intentional Engrish for Funny: The humans' translation software isn't perfect, but it gets better over time. Also, some ridiculous-sounding statements that the characters assume were garbled in translation were, in fact, translated correctly.
 * In the Future, Humans Will Be One Race: Implied.
 * And, in one ending,
 * Just in Time: Deconstructed.
 * Killed Mid-Sentence
 * Meaningful Name
 * Mental Affair: "Super Happies"
 * Mental Fusion: "Super Happies"
 * Mindlink Mates: "Super Happies"
 * Mr. Exposition
 * Multiple Endings: Including interactivity - the author announced at the split point that the true ending would be determined by whether anyone came up with the correct solution in the comments to the post before the critical update.
 * Not So Different: "They're a lot like our own children, really."
 * Older Than They Look: The humans have developed biotechnology which is implied to allow them to live forever.
 * Portal Network
 * Reality Ensues
 * : And how!
 * Shout-Out: "The aliens will consider this one of their great historical works of literature, like Hamlet or Fate/stay night..." The Superhappies also have a ship officer with the rank "kiritsugu" which is the family name of a major character from Fate/Zero who had a background role in Fate/stay night.
 * Starfish Aliens: Including a Grotesque Gallery. Could be considered a Deconstruction considering just exactly how different the aliens are.
 * Universal Translator: Justified. The aliens send them an entire copy of the internet, and the humans use statistics to match up languages.
 * Values Dissonance: In-Universe -- the plot is "Future Humans" (as different from us as a typical alien race from more typical scifi) make first contact with two utterly alien species at the same time. Then the Human command crew spend twenty-four hours discussing Values Dissonance.
 * What Is This Thing You Call Love? meets Humans Are Cthulhu: "What is 'untranslatable 2'?"
 * What Is This Thing You Call Love? meets Humans Are Cthulhu: "What is 'untranslatable 2'?"