Three guys are car pooling. One's a mechanical engineer, the other an electrical engineer and the third a Microsoft engineer. The car breaks down, they get out. The mechanical engineer starts checking out all the fan belts, the electrical engineer starts checking out the electricals.

After an hour they still can't figure out what's wrong, so they get back in the car and ask the Microsoft engineer if he has any ideas.

He suggests that they close all the windows, get out, get back in, and open the windows again....