situation. action. result. Start thinking of things that you've done that you can use in an interview. Don't wait until the interview. If you have good situations ready you can kind of make them mold to the question.
When I was doing interviews for EIT program, my STL specifically told me NOT to use Target examples even though I was a TM for over a year. He said they wanted to hear of experiences outside of the job, specifically school examples and that most Target examples they heard all of time