Yes I have seen those , there is also a eastern puff adder, the non poisonus variety, does the same thing and if you bother it enough it rolls over and plays dead. waits till you go away and runs for it.
I grew up in fla. down there we see lots of rattlers, cotton mouths/moccasins, and quite a few of the coral snakes, red and yellow kill a fellow, its a beautiful snake, red/yellow/ black bands around, very peasful, but if they bite you, well your dead. good thing they are usually very gentle, I don't think back in the sixtys they had anti venom for them. but very few people were bitten, heard of a child playing with one on the news, she put it down and it crawled away. the other types, bite you as soon as look at ya. lol I hate snakes too.