This kind of thing dawned on my once when going shopping. I was walking into a supermarket, checked my phone and saw that it had a low battery. I wasn't carrying cash, and I suddenly realised that my "money" could run out of battery and I'd have no way to pay. It's one part of why I buy physical books now (mostly second-hand online) - so I don't even have to think about recharging my book.
Paula: "...what's that?"
Blank Reg: "It's a book!"
Paula: "Well, what's that?"
Blank Reg: "It's a non-volatile storage medium.
It's very rare. You should have one."
