In the first Superman movie, after Lois Lane is killed in the earthquake, Superman appears to reverse time by flying around the Earth and reversing its rotation.
Thinking about it, this makes no sense. But in the movie, it has a certain plausibility. So what gives Superman's feat its plausibility?
(A friend of mine suggested that the Earth didn't actually reverse its rotation due to Superman flying around it, but that the reversing rotation was just meant to suggest that Superman, by flying so fast, was able to go back in time himself. But this, too, makes no sense.)