A helicopter was flying above Seattle when an electrical malfunction disabled all of the aircraft's electronic navigation and communications equipment. Due to the clouds and haze, the pilot could not determine the helicopter's position and course to steer to the airport.
The pilot saw a tall building, flew toward it, circled, drew a handwritten sign and held it up in the helicopter window.
The pilot's sign said, "Where am I?" in large letters.
The people in the tall building quickly responded to the aircraft, drew a large sign and held it to the window of their building.
Their sign read, "You are in a helicopter."
The pilot smiled, waved, looked at the map, determined the course to steer to the SEATAC airport and landed safely.
After they were on the ground, the copilot asked the pilot how the "You are in a helicopter" sign helped determine their position.
The pilot responded, "I knew that had to be the Microsoft building because, similar to their help-lines, they gave me a technically correct but completely useless answer!"