I had a beta release of Windows Chicago (Win 95) on my machine, which had a modem hooked to a phone jack. There was nothing else on the machine, (like AOL). One night I couldn't sleep and came down to snack at 3am. As I walked by the machine, I heard the hard drive spin up and start reading. The modem then started beeping and dialed out! I stood there in amazement as the hard drive flickered as if it were reporting back to the Mother Ship. I yanked the power cable out of the wall and never left the computer alone with an open phone line again.
Why chain mail messages from the 90s have continued to circulate to this day.