The best source I’ve found for explaining how to write flash is this article by David Gaffney in the Guardian. When I discuss flash with my students, I follow this flash-fiction PowerPoint, which I built almost solely around Gaffney’s advice. Then I share several of my favorite flash stories that can be found around the web. The first is “Museum of Hands” by Kim Church. “Note to Self” by Tracy Guzeman at Vestal Review is another. Also “Two Fictions” by Kathy Fish at Blip Magazine. Then I encourage them to give it a go themselves.
Maybe this will help some of you interested in writing sawn-off tales. Good luck! Let me know how it goes.