Author S. J. Rozan, who writes the wonderful Lydia Chin/Bill Smith mysteries has a feature on her website called Six Word Stories, based on the Hemingway premise that it only takes six words to tell a story. His famous example is “For sale: Baby shoes. Never worn.”
Check out this entry and note the author's name! Okay, now that you've read mine, you can check out some of the other ones. They vary as to focus/genre, but they all highlight that brevity does work well in delivering a punch.