Tippy Tinkletrousers is back in the ninth book in this #1 New York Times bestselling series by Dav Pilkey, the author and illustrator of Dog Man George and Harold are behind bars for a crime they didn't commit But just as they are settling into their new life, they are pulled from prison by a time-traveling tyrant named Tippy Tinkletrousers Now the boys are taking a trip back in time to the carefree days of kindergarten, when the scariest...