Loving or aloof, mischievous or cuddly--for many people, their cats are an integral part of the family. Here are extraordinary stories of some of the world's most charismatic and captivating cats: * Princess Kitty, dubbed ''The Smartest Cat in the World,'' was trained to play the piano and do 100 other incredible tricks * ASPCA 2007 cat of the year, Winnie, led her family to a carbon monoxide leak * Simon received the Dickin Medal for his efforts in consoling the wounded on the British navy ship HMS Amethyst * A hospice cat named Oscar can predict patients' deaths * Fred, the ''Undercover Kitty,'' won the Law Enforcement Appreciation Award for helping to nab a fraudulent vet * Scarlett, an incredible mother cat, damaged her eyes saving her five kittens from a New York inferno * Smart and adventurous, Macavity caught a bus several times a week to the nearest fish and chips shop * Lewis, nicknamed ''The Terrorist of Sunset Circle,'' was put under permanent house arrest after biting and scratching six neighbors * And many more.