[Picha]

A helicopter is flying above Seattle when an electrical malfunction disables all the navigation and communications equipment.
Due to low cloud, the pilot can't determine the helicopter's position. He's sees a tall building and flies towards it. When he gets there he hovers by the boardroom window and his co-pilot holds up a sign that reads "Where Am I?!"
The big cheeses in the boardroom quickly respond to the aircraft, draw a large sign and hold it against one of the windows.

"YOU ARE IN A HELICOPTER!"

The pilot smiles, waves, looks at his map, determines the course and lands safely. Once landed, the co-pilot asks him how he did it.
"I knew it had to be the Microsoft building", says the pilot, "because they gave me a technically correct but completely useless answer!"