This was one of my FAVORITE books growing up. I first read this book in second grade and I think that it would be a great book for kindergarten-2nd grade. It is a great lesson I would use to teach students that they should always be on their best behavior. It does not matter if their is a sub or me in the classroom. We would then create an anchor chart, as a class, of appropriate behavior when their is a sub. I would have it displayed in my class to always remind them. We would all decide that we do not want to be "the class from the black lagoon".