I hope the prunes are harmless (would not want to deal with that litter box - LOL!). Otherwise, I'm glad you started this thread. It's a hoot! I thought we had the only weird feline noshers. We used to have one who loved cantaloupe, and he would also crawl into a pumpkin at Halloween if we turned our backs while carving a Jack-o-lantern. Another kitty loved green peas. I knew someone who would feed her dog green beans to help him lose weight. I thought it was odd, but the vet recommended it.