...Zombies which hunts for people with sole purpose - to eat their brains. They feel pain else. Eating brain, they jam the pain for a short time... (From Hollywood folklore)

Don't you think this plot is a metaphor to society and its inhabitants?

1. Urge: almost every man in any way wants to "taste" your brain - to fool, to use, to get sympathy, or to learn how to live in a "right way" or to convince of something. If there is no edible brain, man starts to feel pain, which called solitude.

2. Behaviour: every man born alive, but then it gets specialization and the set of behaviorial reflexes, which defines all his behaviour in life.

3. Physiology: if man would not wash himself, use cosmetic and other hygiene stuff, soon he will appear and smell the same way as characters which prototype he is.