The point of a headline is to get someone to read what follows, so the more sensational, the better. I could take about any headline nowadays: newspaper, magazine article, or on-line item for an example. Expository writing has the goal of explaining as plainly and accurately as possible. So here’s an example of a headline appropriate for the day:
I leave it as an exercise for the reader to re-write a headline as a piece of good old plain exposition. Post some in the comments.