The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
I just stumbled on this thread and find it very interestin
g not only as possibly a "hot spot" on a dry fly but still after fifty plus years of tying I still sometimes crowd the eye and have a heck of a time getting a 6X tippet through a material clogged eye while on the river and the fish are rising.