The Blue screen of Death Screensavers on Linux
Another addition to our prank list. This time we will try to fool our target using the blue screen of death screensavers. Ofcourse, you can't just use a simple Blue Screen of Death screensaver on some Linux running system. You will be caught right away. The smarter thing would be to use such a screensaver which will prompt the user to do what a windower does when BSOD appears, i.e. poweroff the system. BSOD set of screensavers do this job pretty well.
In order to install it, you need to download and install the xscreensaver-data-extra package. I am not sure if this is a universal package and available in all the distros, but in Ubuntu it can be installed using synaptic or apt.
[shredder12]$ sudo apt-get install xscreensaver xscreensaver-data-extra
Once the installation part is done, go to System->Preferences->screensaver. Open it and you will see the BSOD screensaver option. One more thing, you might see two screensaver launchers in the menu, that's because of the two screensaver daemons - gnome and xscreen, but don't worry, it won't do any harm.
Now, you will notice that everytime you select the BSOD option you see a new screensaver, playing a similar prank . These screensavers are mostly kernel-panic/display warning messages taken from various operating systems. You can see the whole list here.
So, the next time our victim leaves his system for a while and returns, he will see some warning message asking/provoking him to restart/poweroff his system. Here are a few of them.