The Hiker Hell blog collects reports of trail emergencies worldwide: lost hikers, injured hikers, and fatalities. Favorite title and story so far is Turtle Fascination Gets Hiker Lost. He even includes the maybe/maybe-not mountain lion attack in Palo Alto, both the original report and the followup, can’t-prove-it story.
Besides the sheer fascination, real examples make great stories for getting Scouts to remember trail safety practices. “Stories” is principle #6 from Made to Stick. Filter through Hiker Hell for items that meet the other principles, then start teaching.