Lost Helicopter

A helicopter pilot is flying to Seattle, and hits a pea-soup-thick fog bank. He becomes completely disoriented, and flies blindly around until he nearly runs into the top few floors of an office building. He recovers in time to avoid crashing, and manages to get the attention of a woman sitting at her desk.

"Excuse me!" he yells. "Where am I?"

"You're in a helicopter," she replies.

"Thank you," says the pilot.

The pilot pulls off sharply to the left, takes one or two crisp turns through the dense fog, and then does a perfect landing at the Seattle-Tacoma airport.

"That was amazing!" says a passenger. "How did you figure out where you were?"

"Easy," says the pilot. "Her answer, while correct, was absolutely useless. So I immediately knew I was at Microsoft technical support."