Why do some people (usually women) hoard cats? What makes somebody, that would otherwise be normal, be "the crazy cat lady"?

Perhaps its mental imbalance (a specific obsessive-compulsive behavior known as compulsive hoarding or animal hoarding) or perhaps, the answer is a little bit more mundane for some (see mark 1:20).

Here's the trailer for a documentary called "Cat Ladies" by Christie CAllan-Jones of Chocolate Box Entertainment: hit play or go to Link [YouTube]