While Mark and I were visiting Crater Lake, we saw a guy wandering down the hill to get a better shot.  The only problem was that he was on the snow bank and there was no way of knowing whether the snow was on solid rock or even was stable.  It didn’t seem like a good place to go and stand, even if the photo was better for it.  A short while later, I was looking up at the side of a cliff and saw this snow build up on the cliff edge.  This looked like just the sort of thing that could go at any time.  I wondered whether the space the guy had been on was more reliable than this!