Here's an example of how nature is totally messed up. Some guy in Alabama posted a video to Facebook of a copperhead snake he'd just decapitated with a machete. And not only is the body still moving, but so is the head.

And when the body gets too close . . . the head bites it.  Apparently it came near his kid, and copperhead bites are poisonous . . . although not as dangerous as people think. WARNING: Mutilated snake!