[NextHendrix]

If you sneak "eject" into a shell script somewhere then, permissions allowing, it will suddenly open the users optical drive if they have one. This works extra well with laptop drives that are spring loaded.

[Gordonjcp]

If it's a motorised one, "eject -t" will wind it back in again.

I used to use this to attract attention to a particular machine in a datacentre, before things like iLO and ridiculously bright blue LEDs.