I think it's already been mentioned here somewhere, but mythical snake stories are endless, when I think about it, I was told several in my youth that turned out to be un-true. The folks that told them, told them for fact because someone had told it to them. I guess those things are like alot of things around here...folklore.
I still remember finding a hog nosed snake when I was around 14. I was teasing it and had it all puffed up and on its back playing possum when an older fella that lived across the road from us back then came along to see what I was up to. He gave me a pretty good lesson on the dangers of the hog nosed snake except he referred to it as a spreading adder. He told me it was kin to the cobra, and probably the most poison snake in the USA.
No tellin' who told him that, maybe his father, or some old man when he was a kid. The difference between him and me though was that I knew the only poisonous snakes we had that are native to the USA were the copperhead, the cottonmouth, the rattle snake, and the coral snake.
I wasn't a smart ass when I was 14, so I didn't argue with the fella. Now if it happened after I was about 16............