The other day, I'm sitting at my desk, minding my own business. I stretch out my knee-cramped leg, and... put my bare foot into something. I really should have looked first, because the texture/feel wasn't familiar. Without thinking, I reached down and grabbed a compressed clod of grass.
Yes indeed... the youngest cat will carry them around, like great booty. She brings them up from the basement garage when I forget to clean up anything I pull out from underneath the lawnmower.
What unexpected things does your cat drag in?