Our kids will be so confused...
Another anecdote: I heard on some NPR show that most kids don't understand what the sound of a record being scratched to a halt actually is. (This sound: http://www.youtube.com/watch?v=Wn6s1FE-yKQ) When asked, they describe it as the noise that is made on TV when you do a double-take.
And since I don't qualify as a kid, I am guessing that most mid-twenties wouldn't know either.
But as far as I can tell, few folks born in the mid-80s had significant direct experience with records, to the point where there were cultural references to our ignorance. In particular, I remember a sunday morning comic strip when I was young that centered around kids not being able to identify a record player. We were right on the cusp of its obsolescence.
To wit, I couldn't tell you the difference between a 33 and a 45 (well, it's rpm, but are they different sizes?), and I've never owned music on vinyl.
I'd wager that people born in the 90s would be the first to be completely unaware of the origins of the record scratching sound.
Though it might make sense in that case as it is what it replaces.
also, imagine the amazement on your kid's (or grand kid's) face when you explain to them the "origin" of the save icon and how it represents a floppy disk which could contain a full 1.44 Mb of data.