First, he blows some bubbles and, as expected, the kids all pop them. Then, he challenges them to NOT pop the bubbles even if one lands on the tip of their nose. Introduce the concept of self control and launch a discussion about stopping to think before you act. Dustin refers to it as a "bullet" in your year that you can refer back to again and again. "Think about that time when we didn't pop the bubbles..."
Creating your own rainstorm...this is so cool! All you need is a clear container, water, shaving cream, food coloring and droppers. Have kids make predictions by drawing what they see and think will happen.