Not so much a quote as a way to classify certain help desk callers ...
Caller: My PC isn't working. All I see is a blank screen
We go through the usual stuff - is it plugged in, switched on, etc, and the caller seems confused by all the stuff we ask them to do. Finally give up on that, and ask ...
Help desk: What is your VCR showing on the front panel ?
Caller: It's flashing 12:00
Help desk: What about the microwave ?
Caller: The same - flashing 12:00
We conclude that we are dealing with a 12 o'clock flasher - someone incapable of setting up any domestic appliance with a timer.
Help desk: Is there a child in the house ?
Help desk: Put them on the line, please. We will have this fixed in a few minutes.