@tubetime We had a lab of Sun workstations (okay, only five of them, but still) at the university when I was a student and I learned you could cat /dev/audio into a file to record audio, and cat the resulting file back into /dev/audio to play it back.

So of course we'd telnet into other workstations to play sounds on them. It got really stupid until someone snitched and /dev/audio was chmod 0600.