I know it is absurd to debate the rules of a reality that does not exist, but this genuinely irks me. You cannot kill a vampire with an MDF stake; werewolves can't fly; zombies do not run. It's a misconception, a bastardisation that diminishes a classic movie monster. The best phantasmagoria uses reality to render the inconceivable conceivable. The speedy zombie seems implausible to me, even within the fantastic realm it inhabits. A biological agent, I'll buy. Some sort of super-virus? Sure, why not. But death? Death is a disability, not a superpower. It's hard to run with a cold, let alone the most debilitating malady of them all.
Another thing: speed simplifies the zombie, clarifying the threat and reducing any response to an emotional reflex. It's the difference between someone shouting "Boo!" and hearing the sound of the floorboards creaking in an upstairs room: a quick thrill at the expense of a more profound sense of dread. The absence of rage or aggression in slow zombies makes them oddly sympathetic, a detail that enabled Romero to project depth on to their blankness, to create tragic anti-heroes; his were figures to be pitied, empathised with, even rooted for. The moment they appear angry or petulant, the second they emit furious velociraptor screeches (as opposed to the correct mournful moans of longing), they cease to possess any ambiguity. They are simply mean.
To begin at the beginning, Haitian folklore tells of voodoo shamans, or bokors, who would use digitalis, derived from the foxglove plant, to induce somnambulant trances in individuals who would subsequently appear dead. Weeks later, relatives of the supposedly deceased would witness their lost loved ones in a soporific malaise, working in the fields of wealthy landowners, and assume them to be nzambi (a west African word for "spirit of the dead"). From the combination of nzambi and somnambulist ("sleepwalker") we get the word zombie.
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