The Keenest Of Them All
The entry on The Horse And His Boy describes that book as being driven by a dryad's prophesy. I'm pretty sure that's the wrong book - I believe Voyage of the Dawn Treader is the one where a dryad prophesies in a way that could be considered self-fulfilling.
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In The Horse And His Boy, it is revealed in "How Bree became a wiser horse" that, a week after Cor and Corin were born, a Centaur prophesied that Cor would save Archenland from the worst danger it had ever been in. A man named Lord Bar (who didn't get on well with the king) heard this and decided that Cor must be gotten rid of. Of course, this meant that he grew up as Shasta down in Calormene, and was eventually able to journey north at the right time and with knowledge that let him save all Archenland.
That was the amazing part. Things just keep going.
Removed:
- The other version of this myth involves Oedipus becoming an athlete, and a thrown discus killing his father, who was watching, by pure coincidence (another myth has another ancient Greek hero, Perseus, doing this to his grandfather, whom he was prophesied to kill).
Wizzard
Pulled this:
- Also in Discworld: Princess Esmerelda Margaret Note Spelling. This unusual name was the result of her mother Magrat Garlick's attempt to correct a mistake made by her own mother, who had intended for Magrat to be named "Margaret" but was unable to spell the name properly when she wrote it down for the priest. In an effort to ensure the proper naming of her child, Magrat appended "Note Spelling" in the note she passed to the priest. This back-fired when he read out the complete sentence, but the deed had been done and by their culture or law could not be changed.
Another example from Star Wars Legends. The book the Essential Guide to Warfare revealed that Sifo-Dyas created the Grand Army Of The Republic (The official name for the Clone Army) after he saw a vision of the Republic being destroyed in a war. As anyone who has seen Revenge Of The Sith would know his clone army actually help that vision come true making it a case of this trope.
I am one with the force. the force is with me