Ed Dancing raisins activities. Lots of fun experiments. I have done this experiment, and seen the entire class become silent out of curiosity. It is a great engagement piece for a lesson, and it can be hands on if you ask for volunteers!
Education 325 (Chemistry) Dancing Raisins Science Experiment for Kids - This is such a fun science project for preschool, kindergarten, grade, and grade kids. They will be amazed as they see chemical properties at work.