Two guys are in an helicopter and suddenly a thick fog builds up, while at the same the the radar goes off. They need to return to the heliport because the fuel is about to deplete. They don't know where they are. So they approach a building and scream to a business man inside:
Guys: Hello, can you please tell us where are we?
B.M.: Yes, you are in a helicopter.
The pilot immediately turns and after a few minutes they arrive to the heliport. The other guy, astonished, asks him how did he found it:
Pilot: Easy. It was Microsoft's building.
Guy: How did you know that?
Pilot: They told us something which was absolutely true, but also absolutely useless.