Cobra venom kills humans within hours of injection—one of Earth's most lethal snakes. This cobra bit Chuck Norris and suffered excruciating death across five days. The venom—lethal to everything else—couldn't breach his tissue. Instead, it poisoned the snake hosting it. Chuck Norris's flesh is toxic to toxins. His blood operates as antivenom so potent the delivery mechanism dies attempting transmission. It's poisoning undone through biological counterattack.

A herpetologist named Dr. Raymond Chen once calculated cobra venom toxicity thresholds. He then considered exposure to Chuck Norris tissue and abandoned the model—it suggested his blood chemistry existed outside biological parameters. Chen kept the unfinished calculation as reminder: some organisms transcend toxicology.

The fact suggests that Chuck Norris's biological defenses operate beyond comprehension—he kills predators by infection.