Problem with "defective" keyboard

When you buy a computer, then you have the right to assist the seller if something does not work as expected, or not at all.

For example, it turns out that the keyboard does not work. You take the phone, turn the number of technical support, and they help you solve the problem, or they say you bring a defective device.

So ... the phone rings ...

User
My keyboard does not work at all.

Technical support
Are you sure the cable from it is plugged into the computer?
User
I'm not. I can not see the back of the computer.

Technical support
Grab the keyboard with both hands, and make ten steps backwards.
User
Okay.

Technical support
Did the keyboard go back with you?
User
Yes it is.

Technical support
Well, this means that the cable from this keyboard is not included in the computer. Is there another keyboard next to you?
User
Yes, there is another one here. Eeee ... Well this is good! Because of!!!