I'm afraid I can't really respond to this without thinking back.
Try looking at the Zombie Survival Guide (hint: if you see the word insipid, it's a real word, not a typo). That's all real, hard-earned research, and nothing like the crap other people on this site talk about... running zombies. That's BS.
....We don't believe that undead-eat human flesh-zombies exsist. Now voodoo zombies do or did exist. A voodoo zombie was a person heavily drugged a witch doctor. The person would then go into a coma and would be mistaken as being dead. Eventually, the person would come out of their coma, and everyone thought that they had risen from the dead. Some say the voodoo zombies did the witch doctor's bidding, but that is probably not true.