Zombie Cat:

Where zombies come from...

Schrödinger's Cat explains the origin of zombies.  After all, once that cat is in the box and the box sealed, it is considered to be both alive and dead at the same time. Interesting—unless you're the cat.

By putting a real cat in a real box under identical conditions, a third possibility exists when opening the box.  Cat…radiation…I've seen the 1940s and 1950s horror movies—a cat comes out of the box that is still both alive and dead, i.e., a zombie cat!

This even explains the craving for brains.  After all, the original exercise was only supposed to be a thought experiment, only carried out in the brain!  By eating brains, the zombie cat can limit the possibility of another such experiment involving cats.