I used to have so many of those models as a kid. After awhile I got bored of having them all around my room so my best friend and I would take model rocket engines and stick them out the back and fire them off down the road. They usually just went tumbling along, didn't actually go straight too often! At the end, when the engine shoots it's last shot out the other end to pop the chute, the model would go on fire and melt-down in the middle of the road. Man, my father used to get pissed at us for leaving molten blobs in the middle of the street, they looked like turtles!