helpdesk and customer
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 steps back.
Helpdesk: Did the keyboard come with you?
Helpdesk: That means the keyboard is not plugged in. Is there another keyboard?
Customer: Yes, there's another one here. Ah...that one does work!