Open a newspaper and show everyone the inside. Refold it and pour in a cup of water. Unfold the paper to show that nothing pours out. Where did the water go? Refold the newspaper and turn it upside down. Then pour the water back into the glass. A great introduction for any talk that involves water or thirst such as the wilderness wanderings, Jesus being the Living Water or the story of the Samaritan woman at the well. This is also a great illustration for Jesus taking our sins away and how Jesus is always with us even though we can’t see him.
And, if you want to use a drop of food coloring, when you pour the water out, it can be red!
This is a trick you can use again and again.