Cloudy With A Chance Of Meatballs is one of my favorite books to this day. I love all of the illustrations and the cute text that goes along with it. I would use this book in my 2nd grade class and introduce making predictions. I would ask the students, based on the illustrations and title what they thought the book was about. At the end, we would infer whether our predictions were correct and "why" or "why not" food falling from the sky would be a good thing. There are so many cute activities and a movie that could follow the lesson!
These are GREAT books for introducing cause and effect. I would teach these books to second grade and have an anchor chart with the students predictions vs. what the book states. I would then pass out a sequence of events pictures and have the students put them in the correct order. These were always some of my favorite books growing up and really helped me understand cause and effect.