I, hand to your preferred deity, took an "I can't get on the internet" call at an ISP where the cause was a power outage.
They were on a land line phone and their mind was blown that wired telephones didn't get their power from your household electric. Determined that since the phone and computer both get plugged into phone lines they should both work.
Yeah, I know. I've outed myself as being old as fuck before.