Time Travel
Obviously the grandfather paradox (going back and killing your grandfather so you would not exist and therefore can not go back in time and kill him so then he doesn't die but then does give birth to your dad...) is messy and a no-no, but perhaps there are some other options if the power were possible.
I guess there is what happened in Harry Potter and the Prisoner of Azkaban, where Harry and Hermione stayed out of the way when freeing *spoiler* Buckbeak and Sirius. But even then there's a mess of Harry casting the Patronus. But I'm focusing on the first part where what they do does not affect future knowledge before going back in time.
On that note, what if you could go back in time to fix a past mistake, but then tell yourself to go back in time to make sure the mistake is fixed? That way, although the mistake would not have happened in the first place, you are still making sure it is prevented.
But then there is what happens sometimes in Star Trek and Stargate: alternate universes. One little change splits the timeline in two: One of the original and the other of it "changed." But even then there are different takes. Star Trek 11 instead focused on the alternate timeline. Something happened in Stargate Atlantis that made me think we are now watching an alternate universe Atlantis team (being exactly the same) that had the happy ending while the original group was left to die. (And then there's the whole SGU Time episode. )
And then sometimes The Doctor realizes that, although he tries to stay out of it, he causes the event to occur. *coughPompeiicough*
-CF
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