B***** kids!!! Was running downhill on a path partly blocked by school kids skiving around. Some saw me coming and got off the path - but others didn't so I got one foot off the path (onto grass) myself. Whatever was under the grass, I don't know but my ankle rolled. Fortunately, I have always been nimble on my feet ( even now at my age ) and I felt it going so I quickly put the other foot down -- no damage and no pain at all now a couple of hours later -- but it was CLOSE!!!!