I think this is fun to play with, the Gakken MM Circuit race car measures only 2.5cm long and weighing under 3-grams. Load the car into its special wheel-revving charger for 5 seconds and drop it to the bowl-shape race track and you will see it spins round and round at 0.6 seconds per lap. You can get the set at $53. More pictures after the break.

[via Technabob]