If you did not or could not watch that video, we will spoil both it and your dreams: It's a video of a snake head not only refusing to do what any severed head with a shred of common decency should do (die), but also rearing and trying to bite the living s**t out of anyone dumb enough to get too close to it.
If you're anything like us, cutting off a deadly snake's head is your best and only move. If that doesn't work, our only follow-up attack is bowing respectfully and doing whatever the hell that severed head wants us to do.
So, What Makes This Abomination Possible?
The snake has heat-sensitive pits at either side of its face, which it uses to detect threats -- and let's face it, if you're close enough for your body heat to be detected, you're close enough to be considered a threat. Oh, and also what the hell are you doing standing so close to a venomous snake's face?
These heat-sensitive pits are capable of detecting a threatening presence for hours after death, which means the snake may continue to defend itself, zombie-style. And yes, this applies even if the body is no longer attached. So anyone dumb enough to poke and prod it to assess its level of deadness may quickly find themselves with a sudden increase in the level of pissiness of their pants when the snake's movement sensors kick into action.