Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
and there was a bear
Well bears always end my fishing. As a matter of fact if someone told me there were dozens of rising 24" - 26" browns in such and such stream and they were avid feeders but there were frequent grizzly sightings I would never go there.
but your word "failure" triggered memories of my own self criticism for days that did not go as well as I wanted