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.
The magic fly for me is a bead-head brassie
They are so simple, cheap to tie, and EFFECTIVE that I always try to keep a plentiful stash in my fly box. I've caught grayling, dolly varden and rainbow trout on it.
There is one problem about the fly...or maybe it could just be my tying style.:) The peacock hurl tends to unwind. So instead of tying two or three hurls in at once I'll try doing one at a time.
...and a bead-headed nymph that bore a striking resemblance to a brassie...