Professor Pippy P. Poopypants takes over science class at Jerome Horwitz Elementary in the fourth book in this #1 New York Times bestselling series by Dav Pilkey, the author and illustrator of Dog Man! George and Harold are fourth-grade buddies with a penchant for practical jokes. When the boys` latest prank drives their science teacher over the edge, their clueless principal, Mr. Krupp, quickly hires a replacement: Professor Pippy P. Poopypants. Of course, George and Harold can`t resist making ...