This gets funnier. I just asked the little one whether his comment had been as spontaneous as it had seemed at the time, and got a sigh and eyes rolling for my trouble.
"Dad, it is a joke off the Internet. All the kids in school say that whenever they see a diskette."
Quite possibly both? I can definitely see where my son is coming from, as he's only seen floppies once in his life, whereas even his Nintendo Switch uses a floppy to indicate that it is saving his progress. Must be baffling.
I hadn't felt as old as I did then since I bumped into the first kid who didn't know what a landline was. ("Imagine a cellphone with no battery, so you needed to keep it plugged in at all times...")
Sigh.