If zombies are already dead to begin with, then freezing them, putting them in the oven, microwaving them, beheading them, shooting them, etc... shouldn't make them any deader. The fact that they're animate at all violates all sorts of physical laws so violating more shouldn't hurt, right?
Movies have it all wrong. By my logic, zombies can't possibly "die" through physical harm ... the frightening fact is that the only way to render them inanimate is to actually destroy the matter from which they are made! These zombie survivors in the movies should have been equipped with handheld tactical nukes ...
P.S. Being a zombie is like god-mode in Quake at the price of your intelligence and motor skills! Immortality as a retarded zombie, or mortality as a sophisticated human?