As he was flying through the fog, trying to find the airport, he flew past a tall building and saw a man standing in front of an open window.
"Where am I?", he yelled to the man.
"In an airplane," the man replied.
The pilot immediatly turned the plane, and made a perfect landing at the airport. One of the passengers asked the pilot how he had found the runway when he couldn't see the ground through the fog.
"The answer the man in the window gave me was 100% accurate, but totally useless" he replied. "So I knew that building had to be Microsoft technical support. And I knew Microsoft technical support was exactly 1/2 SSW of the airport."