"Some audience members at Dallas complained that the film never offers any rational explanation for the sudden plague of zombies. But of course not. No explanation would be rational, and any explanation would undercut the creepiness of the danger. What the film does do is raise sneaky questions in our minds. It's impossible, for example, to watch the zombies marching through a shopping mall, accompanied by Muzak, and not find a satiric statement on the mildly trance-like state Muzak is supposed to inspire in shoppers. It's disturbing to see images of horror juxtaposed with the gaudy artifacts of a lawn furniture display. And it's difficult to make up our minds about the endless violence inflicted on the zombies. They are shotgunned, run over, hacked to bits, decapitated by helicopter blades . . . and after a while we notice that our reaction to this mayhem is curiously complex. On the one hand, the violence isn't as disturbing as it would be against "real" human beings: Since the victims are without intelligence or personalities (and, for that matter, are already dead), their fates are less compelling. And yet, at the same time, we feel a sympathy for them: It is not their fault that they're zombies, and their activities aren't deliberately anti-social. It's just in their nature to eat human flesh."