What happens to your blood when a snake bites you?

Let's say you are walking in Africa, minding your own business... when suddenly a snake bites you. Let's put it this way: you are in trouble. Do you know why they call the black mamba snake "seven steps"? Because that's what you can do after you're bitten before you die.

Oh hai, black mamba!

As a way of showing you what the venom can do - in this short video below the break, they've put one (one) drop of a Russell's Viper's venom into a Petri dish of blood. The result is bloodcurdling (pun intended).