An mechanical engineer, physicist, and computer programmer are in a car driving down a steep mountain when the brakes fail. The careens around bends picking up speed until they finally reach the bottom and the car rolls to a stop.

The engineer hops out of the car and begins inspecting the brakes for the source of the failure. The physicist grabs a pad of paper and starts calculating the maximum angular momentum and friction coefficients.

The computer programmer looks at the car, then at the mountain and says, "let's push it up to the top and see if it happens again."