Here is yet another highly venomous fish that has taken the lives of many off the coast of Florida and the Caribbean. It's often hard to spot, blending in quite easily with rocks below it, and when stepped upon, the fish releases a deadly toxin proportional to the amount of pressure applied to it. The pain is so severe that—well, we'll just let an actual victim explain: "Imagine having each knuckle, then the wrist, elbow and shoulder being hit in turn with a sledgehammer over the course of about an hour. Then about an hour later, imagine taking a real kicking to both kidneys for about 45 minutes, so that you couldn’t stand or straighten up." Yikes!