Back when I was into amateur radio, I would listen to RF noise emitted from my computer, and I enjoyed the feedback which gave me a sense of what was going on.

Back when I was into amateur radio, I would listen to RF noise emitted from my computer, and I enjoyed the feedback which gave me a sense of what was going on. I could tell whether the computer was waiting, polling, or just really busy. We used to be able to tell how busy the computer is by listening to the hard drive click. As computers get quieter, this kind of feedback would be useful.