Basic Trope: A plot twist occurs with no foreshadowing or anything.
Straight: Alice discovers that Alex is her long lost brother despite any foreshadowing or that being informed that she even had a brother to begin with.
Exaggerated: Alice discovers that Alex is her long lost brother AND and a descended from royalty, AND an alien, AND a clone, AND the Big Bad AND that she was Dead All Along.
Justified: No one bothered to tell Alice because they thought that it would not be of use.
Alternatively, Alice never heard about a twin because she doesn't have one; Alex is mistaken.
Inverted: Incredible amounts of foreshadowing are displayed throughout the course of the story only to not be revealed at all.
Double Subverted: Alex: "But I am your father, no kidding."
Parodied: Every time a twist is revealed with no foreshadowing, a "BUM BUM BUM" is played with Alice's reaction.
Deconstructed: Without any evidence prior to the revelation to back his story, Alice rejects the idea out of hand and dismisses any new evidence as fabricated after the fact.
Reconstructed: Only for a long-lost letter from their parents to arrive and confirm the story, shocking her all over again.
Zig Zagged: Alice: "You're my father?"
Alex: "Nah, that's a lie. But actually, I'm your uncle!"
Averted: Alice was told by many people that she had a brother.
Enforced: "Hey, I have a good idea! Let's have Alex be Alice's brother!" "Aren't we a little far into the story?" "Who cares?They won't notice."
Lampshaded: Alice: Wow, I'm surprised nobody ever told me about you!"
Invoked: Bob withholds knowledge of Alice having a brother by any means to push her in a Heroic BSOD.
Exploited: Bob ensures Alice learns she has an unknown brother then sends Chuck to throw her further off-balance by claiming to be said brother.
Defied: Bob tells everyone that Alice has a brother and gives them hints to give Alice to push her in a Heroic BSOD
Conversed: "The story was pretty good, but then in the last half hour they just pulled this major twist out of nowhere. Really ruined the story for me."