Sometimes phone lines get wet and start to crackle, or not work at all. To correct this, Bell used to tell their consumers to unplug all the phones. They would send an electric shock through the phone lines to zap all the water out of the system. If the phones were plugged in, they got fried.
I wish I had access to that magic button that sends electric shocks through the phone lines. I'd use it to zap those con-artist phone numbers where a machine tells me I've won a cruise, or my car insurance is about to expire, or my credit card is overdue, or whatever BS they're pushing.
That's for costing me another fifty cents on my pay as you go plan, wankers!