Student: Do you still have that thing on your neck?

Me: What thing?

Student: You know...that thing...you wear it around your neck and it keeps memories...

Me: (in my mind) Hmmmm...the thing I wear around my neck that "keeps memories?" My amulet? My (Black Hills Gold) locket? Memory-keeping neck thing....

Then it hits me! He's talking about my memory stick or whatever you call those portable things that you save files on! I was wearing one around my neck the entire previous week. I laughed so hard when I finally figured it out.

I thought that was about the most charming way I'd heard it put though: "the necklace that keeps memories."