Justin Fisher Declares War! by James Preller

From the Publisher: "At Spiro Agnew Elementary, the fifth graders rule the school. And class clown Justin Fisher rules them all.  Or, at least, he did.  Justin has always been the funniest kid in school. But this year, his new teacher isn't amused. And when Justin gets in trouble with Mr. Tripp over and over, the other kids turn on him, too. No one wants to be friends with the class troublemaker.
But Justin Fisher isn't going down without a fight."

Publisher: Scholastic, 2010, 144 pp.