Stumbled across something fun at K-Mart. When I was probably ten or eleven I tried to build myself one of these, but thankfully they sell 'em now: a model rocket engine on a car. I took an all plastic toy truck -- the kind that sell for $2.99 now and that has a hard time keeping the wheels attached -- and taped on a model rocket engine. Left sufficiently unsupervised, I got the whole thing set up, and positioned in the garage and ready to go down the driveway, to land in the neighbors pile of leaves in their macadamia nut field.

Luckily, my own fear of fire stopped me from continuing to try lighting the thing, as it was always a pain to get the rockets lit properly, I know I burned out more igniters than I had engines. And, even then I think I knew that the force of the engine was too much for the little truck. So, I dismantled the rocket truck before anyone came home to yell at me about it.

The neighbors never knew how close they came to being under mini-car-bomb-rocket-attack.