Silence

Try this. Turn off the music. Turn off the TV. If you have to, turn off the computer. Then go into another room, and sit. In total silence. Do you hear that? That ringing? People say it is your brain making up a noise to explain the silence.

People lied.

I can't tell you what's making that sound, but whatever it is, you don't want to meet it. It is trying to break through. Force it's way into our plane of existence.

Now try this. Repeat the first steps. Turn everything off. This time, turn the lights off too. Still hear that ringing? Better hope you do. If you don't, it's because they finally managed to break through.

And no amount of running will save you.