My college roomates used to have a cat who had, I kid you not, 7 toes on one front foot, 6 toes on the other front foot, and 5 toes on each hind foot. The vet said he had never seen a cat with so many toes. And because he had so many toes and they kind of curved around the shape of his paws in order to fit on his feet, his claws came out at all different angles. He used to get himself hooked on things like the carpet, the couch, the drapes, etc. We would get home and he would be stuck to things, unable to detach himself without human assistance!
I also used to volunteer at a hospital and took pictures of the newborn babies. I once encountered a newborn with six fingers on each hand and six toes on each foot. At first I just thought he had very wide feet. Then I started counting and realized there were extra toes.
I think cats with extra toes are extra cute! Human babies, maybe not so much.