[mindcrime]

The variation I like is this:

An electrical engineer, a mechanical engineer and a software engineer from Microsoft are riding in a car, when they start down a steep hill. Halfway down the brakes go out and the car crashes into a tree at the bottom of the hill. Luckily, no one is hurt, so they get out and start analyzing what happened.

Electrical engineer: Clearly a short-circuit in the ABS system caused the brakes to go out.

Mechanical engineer: No, no, it was an over-pressure situation that caused a brake line to rupture.

They both turn to the Microsoft guy and ask him for his opinion:

Microsoft guy: I don't know, but let's push the car back to the top of the hill and try it again.