Stories tell of events that unfold in time, a time that runs parallel to the time it takes to read or narrate any particular story. So there are two times running concurrently: the time of reading/listening and the time within the story.
Could one make these two temporalities run against one another’s grain and narrate a story backwards in the manner that a film can be run backwards? Taking the film analogy literally would imply that each sentence begins with its last word (if not its last sound) so that instead of a story that starts where it ends, one would be left with nothing but shreds of sense.