I always feared the Cottonmouth when I was a kid.. A lot of those between central Texas & Del Rio..
Always stepping on them on river banks.. Hated those things. No rattle..
http://www.emporia.edu/dotAsset/5fc7...cb75169b60.jpg
They were dark, but not black..
Black Racers were the scary super fast snakes.. But pretty harmless..
https://youtu.be/FKAHMjNvQ3M
Only when I don't expect to see a snake, that's when it scares me.
Like when I step on a grass snake while mowing the lawn.!.
(I got a go-cart lawn-mower last year. No more hopping over snakes).
I never expected to see really large Black Racers living in my
Massachusetts backyard.. Texas, yeah.. MA? Nope..
I told my wife about seeing them a couple of times, freaked her out!
Luckily for us, they tend to stay in the woods, and away from the house.