"That's impossible!" No, it's not. This trope is for actions and events that defy the limits set within a series. In Real Life they just wouldn't work, but the rules of fiction are somewhat looser, i.e. whatever the author laid down when constructing it. Someone who, for instance, gains the power to fly when no one else can is not this trope; that is Applied Phlebotinum or Functional Magic or some other trope defining the character's power. Like Reality Unless Otherwise Noted is a good thing to keep in mind when adding examples; aspects of the fictional reality not covered by the author's rules are covered by real life. For the example to count it has to be impossible according to the internal logic of the story.