Take a story you have already written that was never finished or that you do not like very much (a story which seems to be lacking something). With each sentence, in some way substitute opposite words or feelings for the source text. For example: “I went to the gym” becomes “I went for a smoke”; or “He stood” becomes “She sat”; “I am” becomes “I’m not”, “She felt lovely” becomes “She felt hideous”. This is obviously a strange, experimental exercise— and it is possible that nothing good will come of it! Uhm. At least it will be interesting, and will give you a good excuse to get back inside a story that has been lingering too long.
Okay, here is an example of mine. The beginning of an unfinished story called “Chicken Man”