According to the folks at Digital Inspiration, if you have an old Unix computer, you can use a simple code to run a program that automatically opens and closes the CD Rom drive.
Add a string, like in this video, and you've got an automatic baby rocker.
Okay, so maybe it's not practical or a long term solution. But it's damn sure unique.
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Reminds me of old-style Windows clustering:
Put a windows box and a linux box facing each other. Attach a pencil to the CD drive on the Linux box, with the sharp end of the pencil near the reset button on the Windows box.
Write a bash script to ping the windows box every minute or so. If there's no response to the ping, eject the CD drive, thereby resetting the Windows box.