We’ve all heard stories about people who walked away from a horrific plane crash, or who came down off the mountain when their companions didn’t, or who returned home from Iraq or Afghanistan when so many of their fellow patriots made the ultimate sacrifice. Sadly, some of them end up suffering from “survivor’s guilt,” which the psychologist and writer Diana Rabb once described as “something that people experience when they’ve survived a life-threatening situation and others might not have.” It seems they can’t help but ask “Why me?

South of Old Faithful, a tiny stream runs beneath the Grand Loop Road—thousands of tourists drive over the little bridge every single summer day.

A trail generally follows the stream on its gentle course to Shoshone Lake. If you walk the trail, you might occasionally see a tiny brook trout finning in a deep, dark corner of the creek. More likely, if you’re not an angler and staring keenly through polarized lenses through clear water isn’t really your thing, you might notice a fish dart for cover as your shadow crosses the stream.