When she gave me it back, she also gave me a piece of plastic that she believed was part of it. Here's what it looked like:
Clearly, it's nothing to do with a Kindle. I would have said it was nothing to do with me, either, but it has my initials on it. It's made of vinyl and is quite old, as it's starting to discolour in places. Also, it only has one prong — there used to be a second one, but at some stage it's been broken off.
Not knowing what it was, I was inclined to throw it away. However, I thought I'd have a go at remembering what it was, and set off a process to do just that. Sure enough, in the middle of the night it came good and I do now remember what the piece of plastic is for. However, before I tell you, I thought I'd give you the opportunity to guess...