Customer: My keyboard is not working anymore.
Tech Support: Are you sure your keyboard is plugged
into the computer?
Customer: No. I can't get behind the computer.
Tech Support: Pick up your keyboard and take ten
Tech Support: Did the keyboard come with you?
Tech Support: That means the keyboard is not plugged
in. Is there another keyboard?
Customer: Yes, there's another one here. Wait a
moment please. . . . . . . Ah, that one does work.