Jumping Car

Children can roll the car back on the ground or table and it will wind up the gears. Once the child lets it go, it will go straight for a moment then the bottom plastic piece will spring out and the car will jump and flip. The plastice piece would be located on the front, bottom part of the car to make sure that it causes enough friction to make the car jump and flip.
The toy is based on the principles of using gears and springs to convert potential energy to kinetic energy.
The cost would be fairly low if the toy were made on a large production scale. The most expensive part would be the gearbox. The toy would be fairly durable and would be able to withstand falls, drops, and being thrown. The car would also be large enough to make sure that children would not be able to swallow and choke on the toy, making it relatively safe for younger children.