One bullet example:
"Student X and Student Y listen to some CDs."
The exchange went something like follows...
Me: "Student X, how many CDs do you have, a lot?"
SX: "Um, I don't have any."
Me: "Oh, how about you Student Y?"
SY: "I don't own any either."
Me: "So, just MP3 files...?"
SX & Y: (with 'of course, silly' look on faces) "Yeah."
Jeez, first I thought I was a total geezer for still owning vinyl.