The word "flip" just got a whole new meaning!!!!
 

Ok, take 2 AAA batterys and put them so they are stacked with one ON TOP of another. you may have to use sticky tack to hold them that way. They should not be pointing up, but sideways. Now put it on the BACK of your car. They should be in front of where the spoiler goes. Use a good motor, like NX. Run your car backwards (it should go slow) and suddenly go foward......and the word "flip out" got a whole new meaning!!! :)