Plush. Soft Kitty, Warm kitty, Little ball of fur. Happy kitty, Sleepy kitty, Purr purr purr. Sheldon's beloved Soft Kitty comes to life with the Big Bang Theory: Soft Kitty Plush. Press the plush on the paw to hear song, "Soft Kitty" at least once a day or as needed. Repeat until symptoms subside.