“Curiosity killed the cat,” Fesgao remarked, his dark eyes unreadable. Aly rolled her eyes. Why did everyone say that to her? “People always forget the rest of the saying,” she complained. “‘And satisfaction brought it back.” ― Tamora Pierce, Trickster's Choice
Nobel Prize-winning author Ernest Hemingway was a famous aficionado of polydactyl cats, after being first given a six-toed cat by a ship's captain. Upon Hemingway's death in 1961, his former home in Key West, Florida, became a museum and a home for his cats, and it currently houses approximately fifty descendants of his cats (about half of which are polydactyl). Because of his love for these animals, polydactyl cats are sometimes referred to as "Hemingway Cats".
Some sources state that these cats are rare in Europe because they were killed as witches' familiars, but other sources indicate that they are quite common in southern Britain. - Wikipedia.
Indy the Smart Cat can open jars without a thumb.