Well, the thing that makes the zombie move is... The brain. Or rather, parts of the brain that are still active enough for it to be re-animated. O_O;
And obviously, zombies aren't real - They are scientifically and medically impossible. Until we see real zombies running around and eating people, we won't have anything to worry about.
I'll be super angry if zombies show up ... And I shoot one in the head... And that's not the weak point... (T_T)
You know, I read a great book series by Brian Keene about a zombie apocolypse... The first book is called The Rising... and the second book is City of the Dead...
Rather than some strange disease or a meteor... Or radiation or anything like that... It's demons angry at God for sending them to The Void... So to get revenge they plan on killing everyone and everything on Earth... Which sucks... because they think... And there's a LOT of them... And they can go from corpse to corpse... Even the corpse of animals... Oh man.
Check them out.. They are really gorey... I mean... A few parts made me say EEEEWWW... And I love gorey zombie goodness! >.>;;