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This and it's follow-up are perfect books for lovers of the Sideways Stories from Wayside School, the My Weird School, and My Weird School Daze series.
From Publishers Weekly:
"A rowdy group of students and their eccentric teacher star in Fleming's collection of determinedly loopy vignettes, each of which ends with an Aesop-like moral. On the day before school opens, the frantic principal still has not found a teacher for the notoriously unruly fourth graders. In walks Mr. Jupiter, whose credentials include working as a translator for Bigfoot, discovering the lost city of Atlantis and studying at the Coochie-Coochie Institute for Misbehaved Monkeys; he is hired on the spot. When he refuses to react to his students' misbehavior, they think up pranks guaranteed to rile him, but no one dares to pull them off (moral: "It is one thing to talk about it, another to do it"). ... there's plenty to laugh at and even to ponder."