EnglishRussia has a post about a snake attacking fish. Supposedly the snake hunted the fish, dragged it out of the water while biting down on its gills to suffocate it and then dragged it inland. All this even though the fish was too big for it to eat. Then he ads details about the snake being poisonous and stealing bait fish from humans.
Hmmm... add lightning shooting out of their butts and we might be dealing with Mongolian Death Worms instead of snakes.