Lilo and Stitch is my favorite Disney/Pixar movie. I've watched it more times than I've watched any other of their films.<---I cry at this scene every time without fail. But also, her name is "Scrump" not scrubb.
I think this all the time. Try going in pitch black with a picher of water, a flashlight, and a bowl. As you pour the water in to the bowl shine the flashlight across the water. It will move sightly with the light.