If you really want to blow their mind, ask them if they can fathom what an 8-track player was. I remember riding with my folks from Ohio to Virginia with Dad popping in 8-track cassettes. There would be a case with 12 or so cassettes in them to tide us over when the radio lapsed out between cities. Songs would pause in the middle as it skipped from one track to the next. Hah!

Good times.