How is the Holy Ghost like a soda can?!" When none of them answered, we discussed how it is easy to crush an empty can. But, a can that is filled is extremely difficult. When we fill our lives with the Holy Ghost, we can not be crushed by adversity!
This would be good for a lesson on sin. First, Jesus took away our sin (the bleach makes the red coloring disappear). Next, Jesus changes our hearts and makes us not want to sin (our hearts are clean, clear water). Last, if we make a mistake and sin leaks in (at the end when the color swirls, doesn't mix in and then disappears), we remember that Jesus paid the price for us and that He promises to carry on His good work in us to completion.