Imagine a technology that projects sound in to a precise spot, and unless you are in the spot, you can't hear it. What's more, the sound isn't heard through your ears, it is heard because it is banging around in your skull, which serves as an amplifier.

Now imagine who would use such a creepy technology.

No, it's not the CIA. It's marketers.

Learn how A&E is projecting voices into skulls of civilians to promote a show about ghosts here.

[Thumbs up to The Denver Egotist for the point.]