Give teams of equal size several Oreo cookies (or have the kids bring their own). Also give each team two serrated knives, two spoons, a box of toothpicks, and a 4-foot-square piece of posterboard. They have 20 minutes to create a sculpture using the cookies the tools they’ve been given. The sculpture is to be built on the posterboard to control the mess. The filling in the Oreo’s makes great “”glue”” or “mortar.” The sculptures are judged and the winning team receives a couple of litres of milk.