Corny, unoriginal, but true
I used to work for a charity giving computer training (word processing, spreadsheets and the like) to special needs groups. We had both a wee "school" where a friend and I managed to blag a Netware3 license from the Uni and we set up a small "Office" network, but also an outreach program, where housebound individuals were given a PC, they were given worksheets, one of our Tutor/Befrienders would spend a couple of hours a week with them, and they submitted their work on 3.5 floppy disks (remember them :) which were collected by our drivers.
One day, one of the folk on the outreach program rang and said that she couldn't save anything, her PC wasn't working. I asked a few questions, but it was quite clear that she wasn't able to really help, so I asked Henry, our driver to collect it and bring to the office so I could look at it.
As soon as it arrived, I put it on the desk, and without even switching it on, I knew the problem - when I put it down, it sounded like a money box. I opened the machine, took out the floppy drive and shook it - a shower of coins fell out. I rang the lass concerned, and asked if her baby was now mobile. She said yes, it's lovely. I said, aye, it is - he thinks the floppy drive is his money box...and that's why you couldn't save anything. She asked me then how the machine was......
"Well, there's no change yet", was my reply.
Sorry.