I was on my first antelope hunt in Wyoming and came really close to stepping on a rattlesnake. I was walking and talking to my buddy as we headed back to the truck and my foot was going to come down directly on a small rattlesnake that was crawling across our path. Luckily my buddy saw it and grabbed me before I put my boot down on it.
Had I actually stepped on it, I doubt it could have bit through, or bit above my boots but either way it scared the hell out me.
"He who laughs last, laughs dead." Homer Simpson