Of course, her very immediate question to me was, "what was the oldest student you've ever had?" I am not certain of the exact age but I am certain he was in his 70's, may have been 80+.
I was teaching a non-credit workshop, a computer primer. The subject was Microsoft Word, it was Word 2000 at that time. I was going over the icons on the toolbar and got to the disk icon (the one circled in red in the figure here in this post). I mentioned that the disk was the icon for the save command. Before I could utter another word, this older gentlemen slammed his hand on the desk and said (and I am coming as close as I can, it's been 15 years), "a disk, hot damn, I always thought it was a television set and I could never figure out why there would be a TV up there!"
That was his revelation. The whole class started laughing and we all had a good time with it then moved on. It was one of those moment you don't forget.