Never Race a Runaway Pumpkin(Roscoe Riley Rules‪)‬

Author Katherine Applegate's stories about Roscoe Riley are popular with young readers who know what it's like to get into trouble-accidentally. When the local bookstore holds a contest to guess the weight of a giant pumpkin, the prize is a bunch of books for the winner's school library and a ton of candy. Roscoe likes books and candy, so he decides to make a guess. But a bad-luck black kitten at the bookstore keeps getting in his way.