Customer: "My keyboard is not working anymore."

Helpdesk: "Are you sure it's plugged into the computer?"

Customer: "No. I can't get behind the computer."

Helpdesk: "Pick up your keyboard and walk 10 paces back."

Customer: "Okay."

Helpdesk: "Did the keyboard come with you?"

Customer: "Yes."

Helpdesk: "That means the keyboard is not plugged in. Is there another keyboard?"

Customer: "Yes, there's another one here. Ahh, that one works!"