Growing up an Air Force brat we were always moving, and Dad was always saying we couldn't move the models, so out came the firecrackers every couple of years and we'd blow 'em up REAL good!
My eldest son, when in Grade 10 a few years ago, had an assignment to build a race car using a rubber band. Most kids in his class used the rubber band to store energy to provide the motive power. My son (proof the apple don't fall far from the tree) used the rubber band to strap two D rocket motors to his sled, hid them under a plastic car body, and fired the lot off in the school gym! Needless to say he had the fastest car. I think he should have gotten marks for creativity as well, but the teacher disagreed ...
Bruce