Who rained on the parade? River Heights Elementary School is putting on an Earth Day parade, and Nancy's class has a special honor: They get to build the floatNancy, Bess, George, and all the kids in Mrs. Ramirez's class have worked hard to make the ``greenest`` float they can, collecting recycled materials to use for decoration. But someone's spoiled all the fun and sabotaged the float days before the parade. Who could've done something like this -- and why? Sounds like another case for the Clue Crew