Creepy OS

Literally everyone knows this situation:

You enter the attic of your dead grandpa, to boot up his old PC. You want something to remember him by, so you search the computer for all of the old music tracks he used to write for you.

When that old tube monitor starts to sing with the voices of a thousand little flickers, you realize that the operating system has been haunted!

Forget about dark dungeons, creepy churches or cemeteries. From now on you can experience all those unspeakable horrors in the best way possible: In a seated, slightly hunched over position - right in front of your computer.