I attended some outdoor-in-the-park thing several years ago (I know, I know--I led a different life then) and there was a woman representing the local wildlife rescue organization who had in a cat carrier her retarded possum. It was brought to them when it was a baby (probably abandoned as unfit for living by its mom), so she took it home to keep it as a pet.

It. Was. Adorable.

I've had a soft spot for possums ever since.