Sometimes we come across the best books in our library. One of them is "How things work in the house" by Lisa Campbell Ernst. The kids are obsessed with this book. They looked thru it about million times and every time they do, they come up to me and ask to make a project they are showing on one of the pages. On the page about Spoons, there was a catapult made out of a plastic spoon and a piece of wood. Since we had all the supplies, I couldn't say no. And the fact that we used marshmallows could not have been any better for the kids. Try it! I guarantee you hours of laughter!