‘Round these parts (the foothills near Denver), the freeze response makes a lot of sense. This is western diamondback rattlesnake territory. Hike around my backyard long enough and you might hear the unmistakable sound of an upset rattler. Take it from me, few sounds evoke a more immediate and powerful stress response. When that happens, the sympathetic nervous system dumps adrenaline and glucose into the system at lightening speed and, if everything is functioning correctly, a person becomes as still as stone despite the energy coursing through his body. In the right situations, it is a brilliant mechanism. (Guest Contributor: Hachi the Iron Dog.)