Customer: My keyboard is not working anymore. Tech support: Are you sure it’s plugged into the computer? Customer: No. I can’t get behind the computer. Tech support: Pick up your keyboard and walk 10 paces back. Customer: OK Tech support: Did the keyboard come with you? Customer: Yes Tech support: That means the keyboard is not plugged in. Is there another keyboard? Customer: Yes, there’s another one here. Ah...that one does work.