Which school supply is in charge of all the others?The ruler. School days = fun days with these hilarious jokes, riddles, and knock-knocks! Artie: Do ghosts attend school? Leah: Sure. Haven’t you heard of school spirit? Put the comedy back into the classroom with this sidesplitting collection of schoolroom humor. With more than 600 jokes, it covers everything from library time and recess (What do mice like to play during recess? Hide-and-go-squeak!) to spelling bees and tests (What type of exam features famous fathers from history? A pop quiz).