Half a squirrel skeleton.
Not that strange when you consider we have cats... but the situation was weird. I was at my parent's house helping out my mom after one of her surgeries. She'd hired some house cleaners to d a spring cleaning because she was incapable of doing so. Partway through, one of the women comes up to me and says they've found something in the basement and don't know what to do with it. I go downstairs and find that behind and underneath a chair, thee is the top half of a squirrel skeleton. It just ended somewhere along the spine, and the top half was perfectley preserved little white bones all still connected. There was a but of fur and bug casings around it in a halo of decomposed things... but it was just a skeleton.
I thought it was hilarious and took it upstairs to show my mom and she thought it was funny too. We also made a pact never to tell my sister it had been there because her bedroom had been a few feet away and she always complained about the smell down there. It was also my dad's tv chair, but my dad broke his nose when he was younger and can't really smell anymore, so he never noticed a squirrell carcass under him.
Other od things? Well, one cat has brought in everything possible. Aside from skunks. They just hang around the back door and spray them sometimes.
Last summer my mom called me at work in a panic because the cat had brought a bat into the house. I think I actually peed myself a little laughing, then left work to go hlp her because she'd managed to trap it in the closet where it was dangling from her clothes. One of the nighbourhood kids had gotten rid of it by the time I got there, but we took the cat to the vet for a rabies shot in case. Didn't think to keep the bat. Luckily it's terribly uncommon for bats to have rabies in this area, and the cat's all good. We took all three cats for boosters that day anyway.
Cats. Cats are fun. ... Except when they're not.