Cable entry in cupboard door - help please

[Nail]

Hi i don't understand how you would have something plugged in the cupboard and bring it out with out unpluging it with the wire through a hole ,if the plug is in the cupboard surely the wire at somepoint be in the way of the door when you shut the door maybe i am being thick.
would be a good trick to see.
Phil

The hole in this case is a notch or slot.