I thought we could post some silly things that you have done when bored, or fun experiments you have tried.
Get a bottle of Coke, drop some Mento's (the freshmaker) into the bottle. DO NOT PUT NEAR YOUR FACE They will shoot out like rockets. The kids got a kick out of this.
Collect pinecones and dry them out. Bring them camping and toss them in the fire, the flame turns blue. We have 4 pine trees, so every year before camping the boys bring a bag of pine cones.