A pilot is flying to Seattle and gets lost in a thick fog. He sees a tall building through the haze and calls out to a person on the roof: "Where am I?". The person responds: "You are in a plane." The pilot says thanks, sets a heading a flies straight to the Seattle airport.

His passenger asks: how did you know how to get to the airport from that answer.

The pilot responds: The answer was completely accurate yet totally useless. That must have been the Microsoft building just a few minutes from the airport.