A long time ago I house sat for one of my sisters. At the time she had one dog and three cats.
I had taken my pantyliner out and thrown it away in the bathroom trash can, but the next day I found it in the mudroom!
I mentioned this to my sister when she came back and she said "Oh yeah, I have to throw my feminine products in the kitchen trash, otherwise the cats fish them out and play with them."
Thank god it wasn't something worse.
I've also heard from friends that their cats like to play with used q-tips. Yuck!