Hmm...I guess it was the time a couple of years ago when I was bowhunting in October, and started to step across a log and heard the loudest hiss I had ever heard. I froze in place and and there was a cottonmouth directly under where I was about to step. I had snake boots on, but it still rattled me. I backed off. I guess he was as scared as me, because he just lost his head.
