What's the weirdest thing your cat has brought in?

My cat once brought in a bat. A live, healthy bat. She didn't wound it at all. It was flying around in my room when I was on the computer with my lights off for at least ten minutes. It was only pointed out to me when my sister came in, saw something flying around in the dark, and said, "Maelstrom, there's a bird in your room!" And lo and behold, it was no bird, but a bat.

So what's the weirdest thing your cat has brought in? A bat? A bird? Another cat?