Here We Go Again!: The story ends with the conflict repeating or the characters going through a new conflict similar to the one that was already resolved.
I Do Not Like Green Eggs and Ham: A character spends the story claiming they hate something, then finds that they actually like it when they finally give it a chance.
Leaning on the Fourth Wall: A character makes a statement that makes sense in-universe, but can also be interpreted as the character acknowledging that they are in a work of fiction.
Least Is First: A lowest-status character steps forward first, shaming the higher-status ones into supporting a course of action.
Not Helping Your Case: A character tries to prove they are not what they're accused of being, but their attempts only add fuel to suspicions that the accusations are true.
Not in Front of the Parrot!: A character screws up by revealing secret or embarrassing information in front of a parrot.
The Tape Knew You Would Say That: Someone talks to a recorded message from someone and the person in the video or recording is able to accurately respond to the statements even though they're not really around to hear what the other person is saying.
Unknown Lands: Distant and mysterious lands where anything can happen and any strange thing can come from.
Un-person: A person for whatever reason (commonly because they've become disgraced) has all evidence and records of their existence removed or revised to make it seem as if they never existed in the first place.
Unsafe Haven: A sanctuary that is easy to break into.
Unseen Audience: The narrator turns out to have been telling the story to an in-universe character.
Villain Ball: The villain's downfall comes from the inability to resist the urge to continue doing bad things in situations where doing so would be impractical.