Karlin (Little Big Mouse, 1991, etc.) sets off words like stones skipping across water in this nimble I Can Read. Wilma the Witch's household equilibrium is disrupted when the fat cat takes up residence on the green mat, ""That is MY mat,"" says the rat. ""So what?"" ""So get off!"" ""No I won't."" So the rat enlists the help of a bat and a hat and a fish in a dish to dislodge the interloper. Threats are to no avail, nor enticements, nor the broomstick's buzzing antics. Wilma enters, settles the question of property rights by telling the rat, ""My dear little brat, what makes you think this is YOUR mat?"" while the mat gets the last word. With a cat (who's fat), rat, bat, hat, and mat (not to mention the vat where the cat typically dozes) in leading roles, the rhyming scheme is set. Children will love the word dance and the lyric connections, as well as Karlin's feisty cartoon characters.