Back in the mid-90s my dad lost his car keys. Turns out they were in his dressing gown (we’re British) pocket, in the wardrobe. So he bought one of those keyri

Back in the mid-90s my dad lost his car keys. Turns out they were in his dressing gown (we’re British) pocket, in the wardrobe. So he bought one of those keyrings where you whistle and it beeps. This was a Saturday and we were visiting my grandparents, his parents. He told his dad, by now with a mild case of the Alzheimers, that he’d got this thing and that “you beep and it tells you where your keys are”. Well my grandad, who never drove a car let alone used a computer, his mind was blown. He just had no idea how this thing could do that. This went on for a few minutes. Dad, increasingly frustrated: “you just beep and it tells you where your keys are!” Grandad, increasingly confused: “... but ... how?!” It turns out that my grandad was imagining that you whistled and that this little device shouted out, “they’re in your dressing-gown pocket!”