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A mechanical engineer, an electrical engineer and a Microsoft software engineer are riding in a car going to a conference. They start down a hill and the brakes go out, and the car crashes into a tree. Luckily, no one is injured, and they all get out of the car and start trying to figure out what happened.
The electrical engineer looks at the car and says "Hmmm, must have been a short-circuit in the ABS electronics."
The mechanical engineer says "no, no, it must have been an over-pressure situation with a brake line, causing the line to burst and allowing the brake fluid to leak out."
They both look at the Microsoft guy who had been quiet so far and ask "what do you think"?
He looks at the car and say "I don't know - let's push the car back to the top of the hill and try it again".