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.
Fungus: The Massosporan fungus infects Magicicadas, filling their abdomens and destroying their ability to reproduce. Often, their entire abdomen will fall off. The cicadas actually spread the fungus throughout their local colony via mating — the Massosporan fungus is a cicada STD!